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Finding the Fourth Proportional to 85,616.80, 129,066.88 and 79,908

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Solution

The fourth proportional to 85,616.80, 129,066.88 and 79,908 is: 120,460.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,616.80 : 129,066.88 = 79,908 : x
  2. Step 2: Convert to fraction form
    85,616.80/129,066.88 = 79,908/x
  3. Step 3: Cross multiply
    85,616.80x = 129,066.88 × 79,908
  4. Step 4: Simplify right side
    85,616.80x = 10,313,476,247.04
  5. Step 5: Solve for x
    x = 10,313,476,247.04/85,616.80
  6. Step 6: Final answer
    x = 120,460.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.