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Finding the Fourth Proportional to 100,134.49, 138,123.37 and 61,905.73

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Solution

The fourth proportional to 100,134.49, 138,123.37 and 61,905.73 is: 85,391.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,134.49 : 138,123.37 = 61,905.73 : x
  2. Step 2: Convert to fraction form
    100,134.49/138,123.37 = 61,905.73/x
  3. Step 3: Cross multiply
    100,134.49x = 138,123.37 × 61,905.73
  4. Step 4: Simplify right side
    100,134.49x = 8,550,627,740.38
  5. Step 5: Solve for x
    x = 8,550,627,740.38/100,134.49
  6. Step 6: Final answer
    x = 85,391.43

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1.5x scale

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.