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Finding the Fourth Proportional to 558.47, 772.18 and 489.29

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Solution

The fourth proportional to 558.47, 772.18 and 489.29 is: 676.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.47 : 772.18 = 489.29 : x
  2. Step 2: Convert to fraction form
    558.47/772.18 = 489.29/x
  3. Step 3: Cross multiply
    558.47x = 772.18 × 489.29
  4. Step 4: Simplify right side
    558.47x = 377,814.87
  5. Step 5: Solve for x
    x = 377,814.87/558.47
  6. Step 6: Final answer
    x = 676.51

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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.