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Finding the Fourth Proportional to 138,787.60, 208,181.40 and 89,021.20

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Solution

The fourth proportional to 138,787.60, 208,181.40 and 89,021.20 is: 133,531.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,787.60 : 208,181.40 = 89,021.20 : x
  2. Step 2: Convert to fraction form
    138,787.60/208,181.40 = 89,021.20/x
  3. Step 3: Cross multiply
    138,787.60x = 208,181.40 × 89,021.20
  4. Step 4: Simplify right side
    138,787.60x = 18,532,558,045.68
  5. Step 5: Solve for x
    x = 18,532,558,045.68/138,787.60
  6. Step 6: Final answer
    x = 133,531.80

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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.