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Finding the Fourth Proportional to 138,615.92, 191,253.73 and 81,224.49

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Solution

The fourth proportional to 138,615.92, 191,253.73 and 81,224.49 is: 112,068.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,615.92 : 191,253.73 = 81,224.49 : x
  2. Step 2: Convert to fraction form
    138,615.92/191,253.73 = 81,224.49/x
  3. Step 3: Cross multiply
    138,615.92x = 191,253.73 × 81,224.49
  4. Step 4: Simplify right side
    138,615.92x = 15,534,486,476.79
  5. Step 5: Solve for x
    x = 15,534,486,476.79/138,615.92
  6. Step 6: Final answer
    x = 112,068.56

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1.5x scale

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.