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Finding the Fourth Proportional to 138,402.64, 190,995.65 and 74,740.44

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Solution

The fourth proportional to 138,402.64, 190,995.65 and 74,740.44 is: 103,141.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,402.64 : 190,995.65 = 74,740.44 : x
  2. Step 2: Convert to fraction form
    138,402.64/190,995.65 = 74,740.44/x
  3. Step 3: Cross multiply
    138,402.64x = 190,995.65 × 74,740.44
  4. Step 4: Simplify right side
    138,402.64x = 14,275,098,389.70
  5. Step 5: Solve for x
    x = 14,275,098,389.70/138,402.64
  6. Step 6: Final answer
    x = 103,141.81

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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.