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Finding the Fourth Proportional to 908.95, 1,253.64 and 769.45

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Solution

The fourth proportional to 908.95, 1,253.64 and 769.45 is: 1,061.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.95 : 1,253.64 = 769.45 : x
  2. Step 2: Convert to fraction form
    908.95/1,253.64 = 769.45/x
  3. Step 3: Cross multiply
    908.95x = 1,253.64 × 769.45
  4. Step 4: Simplify right side
    908.95x = 964,613.30
  5. Step 5: Solve for x
    x = 964,613.30/908.95
  6. Step 6: Final answer
    x = 1,061.24

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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.