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Finding the Fourth Proportional to 71,658.90, 107,490.78 and 19,068.43

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Solution

The fourth proportional to 71,658.90, 107,490.78 and 19,068.43 is: 28,603.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,658.90 : 107,490.78 = 19,068.43 : x
  2. Step 2: Convert to fraction form
    71,658.90/107,490.78 = 19,068.43/x
  3. Step 3: Cross multiply
    71,658.90x = 107,490.78 × 19,068.43
  4. Step 4: Simplify right side
    71,658.90x = 2,049,680,318.73
  5. Step 5: Solve for x
    x = 2,049,680,318.73/71,658.90
  6. Step 6: Final answer
    x = 28,603.29

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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.