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Finding the Fourth Proportional to 393.75, 587.43 and 374.61

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Solution

The fourth proportional to 393.75, 587.43 and 374.61 is: 558.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.75 : 587.43 = 374.61 : x
  2. Step 2: Convert to fraction form
    393.75/587.43 = 374.61/x
  3. Step 3: Cross multiply
    393.75x = 587.43 × 374.61
  4. Step 4: Simplify right side
    393.75x = 220,057.15
  5. Step 5: Solve for x
    x = 220,057.15/393.75
  6. Step 6: Final answer
    x = 558.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.