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Finding the Fourth Proportional to 138,508.70, 191,214.28 and 98,318.48

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Solution

The fourth proportional to 138,508.70, 191,214.28 and 98,318.48 is: 135,730.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,508.70 : 191,214.28 = 98,318.48 : x
  2. Step 2: Convert to fraction form
    138,508.70/191,214.28 = 98,318.48/x
  3. Step 3: Cross multiply
    138,508.70x = 191,214.28 × 98,318.48
  4. Step 4: Simplify right side
    138,508.70x = 18,799,897,363.89
  5. Step 5: Solve for x
    x = 18,799,897,363.89/138,508.70
  6. Step 6: Final answer
    x = 135,730.81

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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.