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Finding the Fourth Proportional to 658.95, 908.93 and 393.20

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Solution

The fourth proportional to 658.95, 908.93 and 393.20 is: 542.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.95 : 908.93 = 393.20 : x
  2. Step 2: Convert to fraction form
    658.95/908.93 = 393.20/x
  3. Step 3: Cross multiply
    658.95x = 908.93 × 393.20
  4. Step 4: Simplify right side
    658.95x = 357,396.79
  5. Step 5: Solve for x
    x = 357,396.79/658.95
  6. Step 6: Final answer
    x = 542.38

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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.