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Finding the Fourth Proportional to 138,338.60, 207,702.30 and 85,850.60

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Solution

The fourth proportional to 138,338.60, 207,702.30 and 85,850.60 is: 128,896.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,338.60 : 207,702.30 = 85,850.60 : x
  2. Step 2: Convert to fraction form
    138,338.60/207,702.30 = 85,850.60/x
  3. Step 3: Cross multiply
    138,338.60x = 207,702.30 × 85,850.60
  4. Step 4: Simplify right side
    138,338.60x = 17,831,367,076.38
  5. Step 5: Solve for x
    x = 17,831,367,076.38/138,338.60
  6. Step 6: Final answer
    x = 128,896.54

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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.