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Finding the Fourth Proportional to 658.30, 908.45 and 378.59

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Solution

The fourth proportional to 658.30, 908.45 and 378.59 is: 522.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.30 : 908.45 = 378.59 : x
  2. Step 2: Convert to fraction form
    658.30/908.45 = 378.59/x
  3. Step 3: Cross multiply
    658.30x = 908.45 × 378.59
  4. Step 4: Simplify right side
    658.30x = 343,924.12
  5. Step 5: Solve for x
    x = 343,924.12/658.30
  6. Step 6: Final answer
    x = 522.45

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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.