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Finding the Fourth Proportional to 21,779.28, 30,042.90 and 13,807.80

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Solution

The fourth proportional to 21,779.28, 30,042.90 and 13,807.80 is: 19,046.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,779.28 : 30,042.90 = 13,807.80 : x
  2. Step 2: Convert to fraction form
    21,779.28/30,042.90 = 13,807.80/x
  3. Step 3: Cross multiply
    21,779.28x = 30,042.90 × 13,807.80
  4. Step 4: Simplify right side
    21,779.28x = 414,826,354.62
  5. Step 5: Solve for x
    x = 414,826,354.62/21,779.28
  6. Step 6: Final answer
    x = 19,046.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.