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Finding the Fourth Proportional to 718.29, 991.71 and 552.21

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Solution

The fourth proportional to 718.29, 991.71 and 552.21 is: 762.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.29 : 991.71 = 552.21 : x
  2. Step 2: Convert to fraction form
    718.29/991.71 = 552.21/x
  3. Step 3: Cross multiply
    718.29x = 991.71 × 552.21
  4. Step 4: Simplify right side
    718.29x = 547,632.18
  5. Step 5: Solve for x
    x = 547,632.18/718.29
  6. Step 6: Final answer
    x = 762.41

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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.