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Finding the Fourth Proportional to 121,753.60, 168,102.72 and 78,836.80

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Solution

The fourth proportional to 121,753.60, 168,102.72 and 78,836.80 is: 108,848.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,753.60 : 168,102.72 = 78,836.80 : x
  2. Step 2: Convert to fraction form
    121,753.60/168,102.72 = 78,836.80/x
  3. Step 3: Cross multiply
    121,753.60x = 168,102.72 × 78,836.80
  4. Step 4: Simplify right side
    121,753.60x = 13,252,680,516.10
  5. Step 5: Solve for x
    x = 13,252,680,516.10/121,753.60
  6. Step 6: Final answer
    x = 108,848.37

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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.