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Finding the Fourth Proportional to 79,616.90, 109,816.89 and 65,445.14

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Solution

The fourth proportional to 79,616.90, 109,816.89 and 65,445.14 is: 90,269.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,616.90 : 109,816.89 = 65,445.14 : x
  2. Step 2: Convert to fraction form
    79,616.90/109,816.89 = 65,445.14/x
  3. Step 3: Cross multiply
    79,616.90x = 109,816.89 × 65,445.14
  4. Step 4: Simplify right side
    79,616.90x = 7,186,981,740.41
  5. Step 5: Solve for x
    x = 7,186,981,740.41/79,616.90
  6. Step 6: Final answer
    x = 90,269.55

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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.