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Finding the Fourth Proportional to 138,489.73, 191,115.91 and 74,827.51

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Solution

The fourth proportional to 138,489.73, 191,115.91 and 74,827.51 is: 103,262.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,489.73 : 191,115.91 = 74,827.51 : x
  2. Step 2: Convert to fraction form
    138,489.73/191,115.91 = 74,827.51/x
  3. Step 3: Cross multiply
    138,489.73x = 191,115.91 × 74,827.51
  4. Step 4: Simplify right side
    138,489.73x = 14,300,727,282.43
  5. Step 5: Solve for x
    x = 14,300,727,282.43/138,489.73
  6. Step 6: Final answer
    x = 103,262.01

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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.