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Finding the Fourth Proportional to 138,081.90, 207,071.82 and 108,557.40

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Solution

The fourth proportional to 138,081.90, 207,071.82 and 108,557.40 is: 162,795.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,081.90 : 207,071.82 = 108,557.40 : x
  2. Step 2: Convert to fraction form
    138,081.90/207,071.82 = 108,557.40/x
  3. Step 3: Cross multiply
    138,081.90x = 207,071.82 × 108,557.40
  4. Step 4: Simplify right side
    138,081.90x = 22,479,178,392.47
  5. Step 5: Solve for x
    x = 22,479,178,392.47/138,081.90
  6. Step 6: Final answer
    x = 162,795.98

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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.