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Finding the Fourth Proportional to 393.97, 590.93 and 147.15

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Solution

The fourth proportional to 393.97, 590.93 and 147.15 is: 220.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.97 : 590.93 = 147.15 : x
  2. Step 2: Convert to fraction form
    393.97/590.93 = 147.15/x
  3. Step 3: Cross multiply
    393.97x = 590.93 × 147.15
  4. Step 4: Simplify right side
    393.97x = 86,956.62
  5. Step 5: Solve for x
    x = 86,956.62/393.97
  6. Step 6: Final answer
    x = 220.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.