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Finding the Fourth Proportional to 391.30, 586.33 and 314.76

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Solution

The fourth proportional to 391.30, 586.33 and 314.76 is: 471.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.30 : 586.33 = 314.76 : x
  2. Step 2: Convert to fraction form
    391.30/586.33 = 314.76/x
  3. Step 3: Cross multiply
    391.30x = 586.33 × 314.76
  4. Step 4: Simplify right side
    391.30x = 184,553.23
  5. Step 5: Solve for x
    x = 184,553.23/391.30
  6. Step 6: Final answer
    x = 471.64

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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.