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Finding the Fourth Proportional to 908.72, 1,253.36 and 646.64

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Solution

The fourth proportional to 908.72, 1,253.36 and 646.64 is: 891.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.72 : 1,253.36 = 646.64 : x
  2. Step 2: Convert to fraction form
    908.72/1,253.36 = 646.64/x
  3. Step 3: Cross multiply
    908.72x = 1,253.36 × 646.64
  4. Step 4: Simplify right side
    908.72x = 810,472.71
  5. Step 5: Solve for x
    x = 810,472.71/908.72
  6. Step 6: Final answer
    x = 891.88

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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.