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Finding the Fourth Proportional to 908.27, 1,253.46 and 686.84

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Solution

The fourth proportional to 908.27, 1,253.46 and 686.84 is: 947.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.27 : 1,253.46 = 686.84 : x
  2. Step 2: Convert to fraction form
    908.27/1,253.46 = 686.84/x
  3. Step 3: Cross multiply
    908.27x = 1,253.46 × 686.84
  4. Step 4: Simplify right side
    908.27x = 860,926.47
  5. Step 5: Solve for x
    x = 860,926.47/908.27
  6. Step 6: Final answer
    x = 947.88

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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.