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Finding the Fourth Proportional to 19,788.90, 29,691.18 and 8,687.85

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Solution

The fourth proportional to 19,788.90, 29,691.18 and 8,687.85 is: 13,035.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,788.90 : 29,691.18 = 8,687.85 : x
  2. Step 2: Convert to fraction form
    19,788.90/29,691.18 = 8,687.85/x
  3. Step 3: Cross multiply
    19,788.90x = 29,691.18 × 8,687.85
  4. Step 4: Simplify right side
    19,788.90x = 257,952,518.16
  5. Step 5: Solve for x
    x = 257,952,518.16/19,788.90
  6. Step 6: Final answer
    x = 13,035.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.