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Finding the Fourth Proportional to 391.35, 586.96 and 215.22

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Solution

The fourth proportional to 391.35, 586.96 and 215.22 is: 322.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.35 : 586.96 = 215.22 : x
  2. Step 2: Convert to fraction form
    391.35/586.96 = 215.22/x
  3. Step 3: Cross multiply
    391.35x = 586.96 × 215.22
  4. Step 4: Simplify right side
    391.35x = 126,325.53
  5. Step 5: Solve for x
    x = 126,325.53/391.35
  6. Step 6: Final answer
    x = 322.79

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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.