Home / 20,691.15-28,549.45-13,531.56

Finding the Fourth Proportional to 20,691.15, 28,549.45 and 13,531.56

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Solution

The fourth proportional to 20,691.15, 28,549.45 and 13,531.56 is: 18,670.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691.15 : 28,549.45 = 13,531.56 : x
  2. Step 2: Convert to fraction form
    20,691.15/28,549.45 = 13,531.56/x
  3. Step 3: Cross multiply
    20,691.15x = 28,549.45 × 13,531.56
  4. Step 4: Simplify right side
    20,691.15x = 386,318,595.64
  5. Step 5: Solve for x
    x = 386,318,595.64/20,691.15
  6. Step 6: Final answer
    x = 18,670.72

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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.