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Finding the Fourth Proportional to 718.31, 991.74 and 552.21

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Solution

The fourth proportional to 718.31, 991.74 and 552.21 is: 762.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.31 : 991.74 = 552.21 : x
  2. Step 2: Convert to fraction form
    718.31/991.74 = 552.21/x
  3. Step 3: Cross multiply
    718.31x = 991.74 × 552.21
  4. Step 4: Simplify right side
    718.31x = 547,648.75
  5. Step 5: Solve for x
    x = 547,648.75/718.31
  6. Step 6: Final answer
    x = 762.42

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.