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Finding the Fourth Proportional to 522.15, 724.30 and 494.47

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Solution

The fourth proportional to 522.15, 724.30 and 494.47 is: 685.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.15 : 724.30 = 494.47 : x
  2. Step 2: Convert to fraction form
    522.15/724.30 = 494.47/x
  3. Step 3: Cross multiply
    522.15x = 724.30 × 494.47
  4. Step 4: Simplify right side
    522.15x = 358,144.62
  5. Step 5: Solve for x
    x = 358,144.62/522.15
  6. Step 6: Final answer
    x = 685.90

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.