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Finding the Fourth Proportional to 100,680.40, 138,923.40 and 58,242.88

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Solution

The fourth proportional to 100,680.40, 138,923.40 and 58,242.88 is: 80,366.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,680.40 : 138,923.40 = 58,242.88 : x
  2. Step 2: Convert to fraction form
    100,680.40/138,923.40 = 58,242.88/x
  3. Step 3: Cross multiply
    100,680.40x = 138,923.40 × 58,242.88
  4. Step 4: Simplify right side
    100,680.40x = 8,091,298,915.39
  5. Step 5: Solve for x
    x = 8,091,298,915.39/100,680.40
  6. Step 6: Final answer
    x = 80,366.18

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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.