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Finding the Fourth Proportional to 138,078.60, 207,117.90 and 123,644.40

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Solution

The fourth proportional to 138,078.60, 207,117.90 and 123,644.40 is: 185,466.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,078.60 : 207,117.90 = 123,644.40 : x
  2. Step 2: Convert to fraction form
    138,078.60/207,117.90 = 123,644.40/x
  3. Step 3: Cross multiply
    138,078.60x = 207,117.90 × 123,644.40
  4. Step 4: Simplify right side
    138,078.60x = 25,608,968,474.76
  5. Step 5: Solve for x
    x = 25,608,968,474.76/138,078.60
  6. Step 6: Final answer
    x = 185,466.60

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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.