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Finding the Fourth Proportional to 138,059.62, 206,958.20 and 87,999.18

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Solution

The fourth proportional to 138,059.62, 206,958.20 and 87,999.18 is: 131,915.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,059.62 : 206,958.20 = 87,999.18 : x
  2. Step 2: Convert to fraction form
    138,059.62/206,958.20 = 87,999.18/x
  3. Step 3: Cross multiply
    138,059.62x = 206,958.20 × 87,999.18
  4. Step 4: Simplify right side
    138,059.62x = 18,212,151,894.28
  5. Step 5: Solve for x
    x = 18,212,151,894.28/138,059.62
  6. Step 6: Final answer
    x = 131,915.12

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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.