Home / 28,001.80-42,002.70-20,638.90

Finding the Fourth Proportional to 28,001.80, 42,002.70 and 20,638.90

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Solution

The fourth proportional to 28,001.80, 42,002.70 and 20,638.90 is: 30,958.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,001.80 : 42,002.70 = 20,638.90 : x
  2. Step 2: Convert to fraction form
    28,001.80/42,002.70 = 20,638.90/x
  3. Step 3: Cross multiply
    28,001.80x = 42,002.70 × 20,638.90
  4. Step 4: Simplify right side
    28,001.80x = 866,889,525.03
  5. Step 5: Solve for x
    x = 866,889,525.03/28,001.80
  6. Step 6: Final answer
    x = 30,958.35

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Similar ratio
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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.