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Finding the Fourth Proportional to 79,769.40, 119,654.10 and 68,688.60

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Solution

The fourth proportional to 79,769.40, 119,654.10 and 68,688.60 is: 103,032.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,769.40 : 119,654.10 = 68,688.60 : x
  2. Step 2: Convert to fraction form
    79,769.40/119,654.10 = 68,688.60/x
  3. Step 3: Cross multiply
    79,769.40x = 119,654.10 × 68,688.60
  4. Step 4: Simplify right side
    79,769.40x = 8,218,872,613.26
  5. Step 5: Solve for x
    x = 8,218,872,613.26/79,769.40
  6. Step 6: Final answer
    x = 103,032.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.