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Finding the Fourth Proportional to 20,000.20, 30,000.30 and 13,779.40

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Solution

The fourth proportional to 20,000.20, 30,000.30 and 13,779.40 is: 20,669.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,000.20 : 30,000.30 = 13,779.40 : x
  2. Step 2: Convert to fraction form
    20,000.20/30,000.30 = 13,779.40/x
  3. Step 3: Cross multiply
    20,000.20x = 30,000.30 × 13,779.40
  4. Step 4: Simplify right side
    20,000.20x = 413,386,133.82
  5. Step 5: Solve for x
    x = 413,386,133.82/20,000.20
  6. Step 6: Final answer
    x = 20,669.10

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Half scale
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Double scale
Find fourth proportional to 20,001.20, 30,001.80 and 13,780.40
Similar ratio
Find fourth proportional to 30,000.30, 45,000.45 and 20,669.10
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.