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Finding the Fourth Proportional to 138,323.53, 207,152.66 and 78,979.33

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Solution

The fourth proportional to 138,323.53, 207,152.66 and 78,979.33 is: 118,279.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,323.53 : 207,152.66 = 78,979.33 : x
  2. Step 2: Convert to fraction form
    138,323.53/207,152.66 = 78,979.33/x
  3. Step 3: Cross multiply
    138,323.53x = 207,152.66 × 78,979.33
  4. Step 4: Simplify right side
    138,323.53x = 16,360,778,294.52
  5. Step 5: Solve for x
    x = 16,360,778,294.52/138,323.53
  6. Step 6: Final answer
    x = 118,279.07

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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.