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Finding the Fourth Proportional to 138,568.60, 191,223.48 and 74,905.84

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Solution

The fourth proportional to 138,568.60, 191,223.48 and 74,905.84 is: 103,369.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,568.60 : 191,223.48 = 74,905.84 : x
  2. Step 2: Convert to fraction form
    138,568.60/191,223.48 = 74,905.84/x
  3. Step 3: Cross multiply
    138,568.60x = 191,223.48 × 74,905.84
  4. Step 4: Simplify right side
    138,568.60x = 14,323,755,397.12
  5. Step 5: Solve for x
    x = 14,323,755,397.12/138,568.60
  6. Step 6: Final answer
    x = 103,369.42

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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.