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Finding the Fourth Proportional to 100,693.60, 138,922.56 and 62,439.40

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Solution

The fourth proportional to 100,693.60, 138,922.56 and 62,439.40 is: 86,144.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,693.60 : 138,922.56 = 62,439.40 : x
  2. Step 2: Convert to fraction form
    100,693.60/138,922.56 = 62,439.40/x
  3. Step 3: Cross multiply
    100,693.60x = 138,922.56 × 62,439.40
  4. Step 4: Simplify right side
    100,693.60x = 8,674,241,292.86
  5. Step 5: Solve for x
    x = 8,674,241,292.86/100,693.60
  6. Step 6: Final answer
    x = 86,144.91

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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.