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Finding the Fourth Proportional to 138,494.80, 207,742.20 and 85,963.60

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Solution

The fourth proportional to 138,494.80, 207,742.20 and 85,963.60 is: 128,945.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,494.80 : 207,742.20 = 85,963.60 : x
  2. Step 2: Convert to fraction form
    138,494.80/207,742.20 = 85,963.60/x
  3. Step 3: Cross multiply
    138,494.80x = 207,742.20 × 85,963.60
  4. Step 4: Simplify right side
    138,494.80x = 17,858,267,383.92
  5. Step 5: Solve for x
    x = 17,858,267,383.92/138,494.80
  6. Step 6: Final answer
    x = 128,945.40

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1.5x scale

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.