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Finding the Fourth Proportional to 392.74, 588.90 and 145.75

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Solution

The fourth proportional to 392.74, 588.90 and 145.75 is: 218.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.74 : 588.90 = 145.75 : x
  2. Step 2: Convert to fraction form
    392.74/588.90 = 145.75/x
  3. Step 3: Cross multiply
    392.74x = 588.90 × 145.75
  4. Step 4: Simplify right side
    392.74x = 85,832.18
  5. Step 5: Solve for x
    x = 85,832.18/392.74
  6. Step 6: Final answer
    x = 218.55

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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.