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Finding the Fourth Proportional to 718.35, 991.08 and 552.20

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Solution

The fourth proportional to 718.35, 991.08 and 552.20 is: 761.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.35 : 991.08 = 552.20 : x
  2. Step 2: Convert to fraction form
    718.35/991.08 = 552.20/x
  3. Step 3: Cross multiply
    718.35x = 991.08 × 552.20
  4. Step 4: Simplify right side
    718.35x = 547,269.42
  5. Step 5: Solve for x
    x = 547,269.42/718.35
  6. Step 6: Final answer
    x = 761.84

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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.