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Finding the Fourth Proportional to 391.32, 587.21 and 376.34

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Solution

The fourth proportional to 391.32, 587.21 and 376.34 is: 564.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.32 : 587.21 = 376.34 : x
  2. Step 2: Convert to fraction form
    391.32/587.21 = 376.34/x
  3. Step 3: Cross multiply
    391.32x = 587.21 × 376.34
  4. Step 4: Simplify right side
    391.32x = 220,985.79
  5. Step 5: Solve for x
    x = 220,985.79/391.32
  6. Step 6: Final answer
    x = 564.72

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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.