Home / 15,781.38-21,779.01-9,069.18

Finding the Fourth Proportional to 15,781.38, 21,779.01 and 9,069.18

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Solution

The fourth proportional to 15,781.38, 21,779.01 and 9,069.18 is: 12,515.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.38 : 21,779.01 = 9,069.18 : x
  2. Step 2: Convert to fraction form
    15,781.38/21,779.01 = 9,069.18/x
  3. Step 3: Cross multiply
    15,781.38x = 21,779.01 × 9,069.18
  4. Step 4: Simplify right side
    15,781.38x = 197,517,761.91
  5. Step 5: Solve for x
    x = 197,517,761.91/15,781.38
  6. Step 6: Final answer
    x = 12,515.87

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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.