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Finding the Fourth Proportional to 138,411.72, 191,008.18 and 74,749.52

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Solution

The fourth proportional to 138,411.72, 191,008.18 and 74,749.52 is: 103,154.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,411.72 : 191,008.18 = 74,749.52 : x
  2. Step 2: Convert to fraction form
    138,411.72/191,008.18 = 74,749.52/x
  3. Step 3: Cross multiply
    138,411.72x = 191,008.18 × 74,749.52
  4. Step 4: Simplify right side
    138,411.72x = 14,277,768,816.03
  5. Step 5: Solve for x
    x = 14,277,768,816.03/138,411.72
  6. Step 6: Final answer
    x = 103,154.33

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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.