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Finding the Fourth Proportional to 1,248.30, 1,722.69 and 717.28

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Solution

The fourth proportional to 1,248.30, 1,722.69 and 717.28 is: 989.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.30 : 1,722.69 = 717.28 : x
  2. Step 2: Convert to fraction form
    1,248.30/1,722.69 = 717.28/x
  3. Step 3: Cross multiply
    1,248.30x = 1,722.69 × 717.28
  4. Step 4: Simplify right side
    1,248.30x = 1,235,646.78
  5. Step 5: Solve for x
    x = 1,235,646.78/1,248.30
  6. Step 6: Final answer
    x = 989.86

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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.