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Finding the Fourth Proportional to 138,276.71, 207,479.61 and 71,680.51

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Solution

The fourth proportional to 138,276.71, 207,479.61 and 71,680.51 is: 107,554.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,276.71 : 207,479.61 = 71,680.51 : x
  2. Step 2: Convert to fraction form
    138,276.71/207,479.61 = 71,680.51/x
  3. Step 3: Cross multiply
    138,276.71x = 207,479.61 × 71,680.51
  4. Step 4: Simplify right side
    138,276.71x = 14,872,243,740.70
  5. Step 5: Solve for x
    x = 14,872,243,740.70/138,276.71
  6. Step 6: Final answer
    x = 107,554.22

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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.