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Finding the Fourth Proportional to 100,471.76, 138,670.14 and 66,480.92

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Solution

The fourth proportional to 100,471.76, 138,670.14 and 66,480.92 is: 91,756.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,471.76 : 138,670.14 = 66,480.92 : x
  2. Step 2: Convert to fraction form
    100,471.76/138,670.14 = 66,480.92/x
  3. Step 3: Cross multiply
    100,471.76x = 138,670.14 × 66,480.92
  4. Step 4: Simplify right side
    100,471.76x = 9,218,918,483.73
  5. Step 5: Solve for x
    x = 9,218,918,483.73/100,471.76
  6. Step 6: Final answer
    x = 91,756.32

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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.