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Finding the Fourth Proportional to 393.71, 590.80 and 147.09

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Solution

The fourth proportional to 393.71, 590.80 and 147.09 is: 220.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.71 : 590.80 = 147.09 : x
  2. Step 2: Convert to fraction form
    393.71/590.80 = 147.09/x
  3. Step 3: Cross multiply
    393.71x = 590.80 × 147.09
  4. Step 4: Simplify right side
    393.71x = 86,900.77
  5. Step 5: Solve for x
    x = 86,900.77/393.71
  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.