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Finding the Fourth Proportional to 1,031.76, 1,424.88 and 717.48

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Solution

The fourth proportional to 1,031.76, 1,424.88 and 717.48 is: 990.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.76 : 1,424.88 = 717.48 : x
  2. Step 2: Convert to fraction form
    1,031.76/1,424.88 = 717.48/x
  3. Step 3: Cross multiply
    1,031.76x = 1,424.88 × 717.48
  4. Step 4: Simplify right side
    1,031.76x = 1,022,322.90
  5. Step 5: Solve for x
    x = 1,022,322.90/1,031.76
  6. Step 6: Final answer
    x = 990.85

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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.