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Finding the Fourth Proportional to 68,755, 103,149.78 and 19,507

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Solution

The fourth proportional to 68,755, 103,149.78 and 19,507 is: 29,265.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,755 : 103,149.78 = 19,507 : x
  2. Step 2: Convert to fraction form
    68,755/103,149.78 = 19,507/x
  3. Step 3: Cross multiply
    68,755x = 103,149.78 × 19,507
  4. Step 4: Simplify right side
    68,755x = 2,012,142,758.46
  5. Step 5: Solve for x
    x = 2,012,142,758.46/68,755
  6. Step 6: Final answer
    x = 29,265.40

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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.