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Finding the Fourth Proportional to 557.42, 769.52 and 520.61

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Solution

The fourth proportional to 557.42, 769.52 and 520.61 is: 718.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.42 : 769.52 = 520.61 : x
  2. Step 2: Convert to fraction form
    557.42/769.52 = 520.61/x
  3. Step 3: Cross multiply
    557.42x = 769.52 × 520.61
  4. Step 4: Simplify right side
    557.42x = 400,617.26
  5. Step 5: Solve for x
    x = 400,617.26/557.42
  6. Step 6: Final answer
    x = 718.71

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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.