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Finding the Fourth Proportional to 718.57, 992.13 and 571.55

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Solution

The fourth proportional to 718.57, 992.13 and 571.55 is: 789.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.57 : 992.13 = 571.55 : x
  2. Step 2: Convert to fraction form
    718.57/992.13 = 571.55/x
  3. Step 3: Cross multiply
    718.57x = 992.13 × 571.55
  4. Step 4: Simplify right side
    718.57x = 567,051.90
  5. Step 5: Solve for x
    x = 567,051.90/718.57
  6. Step 6: Final answer
    x = 789.14

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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.