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Finding the Fourth Proportional to 137,923.60, 207,079.80 and 85,435.60

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Solution

The fourth proportional to 137,923.60, 207,079.80 and 85,435.60 is: 128,273.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,923.60 : 207,079.80 = 85,435.60 : x
  2. Step 2: Convert to fraction form
    137,923.60/207,079.80 = 85,435.60/x
  3. Step 3: Cross multiply
    137,923.60x = 207,079.80 × 85,435.60
  4. Step 4: Simplify right side
    137,923.60x = 17,691,986,960.88
  5. Step 5: Solve for x
    x = 17,691,986,960.88/137,923.60
  6. Step 6: Final answer
    x = 128,273.82

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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.