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Finding the Fourth Proportional to 138,428.60, 207,740.10 and 59,599.40

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Solution

The fourth proportional to 138,428.60, 207,740.10 and 59,599.40 is: 89,440.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,428.60 : 207,740.10 = 59,599.40 : x
  2. Step 2: Convert to fraction form
    138,428.60/207,740.10 = 59,599.40/x
  3. Step 3: Cross multiply
    138,428.60x = 207,740.10 × 59,599.40
  4. Step 4: Simplify right side
    138,428.60x = 12,381,185,315.94
  5. Step 5: Solve for x
    x = 12,381,185,315.94/138,428.60
  6. Step 6: Final answer
    x = 89,440.95

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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.