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Finding the Fourth Proportional to 172,140.84, 258,366.96 and 72,374.76

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Solution

The fourth proportional to 172,140.84, 258,366.96 and 72,374.76 is: 108,627.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,140.84 : 258,366.96 = 72,374.76 : x
  2. Step 2: Convert to fraction form
    172,140.84/258,366.96 = 72,374.76/x
  3. Step 3: Cross multiply
    172,140.84x = 258,366.96 × 72,374.76
  4. Step 4: Simplify right side
    172,140.84x = 18,699,246,721.93
  5. Step 5: Solve for x
    x = 18,699,246,721.93/172,140.84
  6. Step 6: Final answer
    x = 108,627.60

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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.