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Finding the Fourth Proportional to 658.80, 908.10 and 518.58

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Solution

The fourth proportional to 658.80, 908.10 and 518.58 is: 714.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.80 : 908.10 = 518.58 : x
  2. Step 2: Convert to fraction form
    658.80/908.10 = 518.58/x
  3. Step 3: Cross multiply
    658.80x = 908.10 × 518.58
  4. Step 4: Simplify right side
    658.80x = 470,922.50
  5. Step 5: Solve for x
    x = 470,922.50/658.80
  6. Step 6: Final answer
    x = 714.82

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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.