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Finding the Fourth Proportional to 102,938.90, 154,149.15 and 67,687.70

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Solution

The fourth proportional to 102,938.90, 154,149.15 and 67,687.70 is: 101,361.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,938.90 : 154,149.15 = 67,687.70 : x
  2. Step 2: Convert to fraction form
    102,938.90/154,149.15 = 67,687.70/x
  3. Step 3: Cross multiply
    102,938.90x = 154,149.15 × 67,687.70
  4. Step 4: Simplify right side
    102,938.90x = 10,434,001,420.46
  5. Step 5: Solve for x
    x = 10,434,001,420.46/102,938.90
  6. Step 6: Final answer
    x = 101,361.11

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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.