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Finding the Fourth Proportional to 391.46, 586.28 and 281.07

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Solution

The fourth proportional to 391.46, 586.28 and 281.07 is: 420.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.46 : 586.28 = 281.07 : x
  2. Step 2: Convert to fraction form
    391.46/586.28 = 281.07/x
  3. Step 3: Cross multiply
    391.46x = 586.28 × 281.07
  4. Step 4: Simplify right side
    391.46x = 164,784.31
  5. Step 5: Solve for x
    x = 164,784.31/391.46
  6. Step 6: Final answer
    x = 420.95

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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.