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Finding the Fourth Proportional to 151,710.78, 209,353.78 and 87,134.59

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Solution

The fourth proportional to 151,710.78, 209,353.78 and 87,134.59 is: 120,241.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    151,710.78 : 209,353.78 = 87,134.59 : x
  2. Step 2: Convert to fraction form
    151,710.78/209,353.78 = 87,134.59/x
  3. Step 3: Cross multiply
    151,710.78x = 209,353.78 × 87,134.59
  4. Step 4: Simplify right side
    151,710.78x = 18,241,955,785.25
  5. Step 5: Solve for x
    x = 18,241,955,785.25/151,710.78
  6. Step 6: Final answer
    x = 120,241.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.