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Finding the Fourth Proportional to 391.93, 588.19 and 145.36

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Solution

The fourth proportional to 391.93, 588.19 and 145.36 is: 218.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.93 : 588.19 = 145.36 : x
  2. Step 2: Convert to fraction form
    391.93/588.19 = 145.36/x
  3. Step 3: Cross multiply
    391.93x = 588.19 × 145.36
  4. Step 4: Simplify right side
    391.93x = 85,499.30
  5. Step 5: Solve for x
    x = 85,499.30/391.93
  6. Step 6: Final answer
    x = 218.15

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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.