Home / 28,701.96-39,609.17-15,781.78

Finding the Fourth Proportional to 28,701.96, 39,609.17 and 15,781.78

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Solution

The fourth proportional to 28,701.96, 39,609.17 and 15,781.78 is: 21,779.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,701.96 : 39,609.17 = 15,781.78 : x
  2. Step 2: Convert to fraction form
    28,701.96/39,609.17 = 15,781.78/x
  3. Step 3: Cross multiply
    28,701.96x = 39,609.17 × 15,781.78
  4. Step 4: Simplify right side
    28,701.96x = 625,103,008.88
  5. Step 5: Solve for x
    x = 625,103,008.88/28,701.96
  6. Step 6: Final answer
    x = 21,779.11

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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.