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Finding the Fourth Proportional to 391.17, 586.36 and 318.19

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Solution

The fourth proportional to 391.17, 586.36 and 318.19 is: 476.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.17 : 586.36 = 318.19 : x
  2. Step 2: Convert to fraction form
    391.17/586.36 = 318.19/x
  3. Step 3: Cross multiply
    391.17x = 586.36 × 318.19
  4. Step 4: Simplify right side
    391.17x = 186,573.89
  5. Step 5: Solve for x
    x = 186,573.89/391.17
  6. Step 6: Final answer
    x = 476.96

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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.