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Finding the Fourth Proportional to 100,685.52, 138,799.11 and 70,376.43

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Solution

The fourth proportional to 100,685.52, 138,799.11 and 70,376.43 is: 97,016.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,685.52 : 138,799.11 = 70,376.43 : x
  2. Step 2: Convert to fraction form
    100,685.52/138,799.11 = 70,376.43/x
  3. Step 3: Cross multiply
    100,685.52x = 138,799.11 × 70,376.43
  4. Step 4: Simplify right side
    100,685.52x = 9,768,185,848.98
  5. Step 5: Solve for x
    x = 9,768,185,848.98/100,685.52
  6. Step 6: Final answer
    x = 97,016.79

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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.