Home / 15,781.68-21,779.17-8,708.56

Finding the Fourth Proportional to 15,781.68, 21,779.17 and 8,708.56

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Solution

The fourth proportional to 15,781.68, 21,779.17 and 8,708.56 is: 12,018.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.68 : 21,779.17 = 8,708.56 : x
  2. Step 2: Convert to fraction form
    15,781.68/21,779.17 = 8,708.56/x
  3. Step 3: Cross multiply
    15,781.68x = 21,779.17 × 8,708.56
  4. Step 4: Simplify right side
    15,781.68x = 189,665,056.26
  5. Step 5: Solve for x
    x = 189,665,056.26/15,781.68
  6. Step 6: Final answer
    x = 12,018.06

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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.