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Finding the Fourth Proportional to 717.66, 991.32 and 553.95

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Solution

The fourth proportional to 717.66, 991.32 and 553.95 is: 765.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.66 : 991.32 = 553.95 : x
  2. Step 2: Convert to fraction form
    717.66/991.32 = 553.95/x
  3. Step 3: Cross multiply
    717.66x = 991.32 × 553.95
  4. Step 4: Simplify right side
    717.66x = 549,141.71
  5. Step 5: Solve for x
    x = 549,141.71/717.66
  6. Step 6: Final answer
    x = 765.18

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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.