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Finding the Fourth Proportional to 391.16, 586.55 and 159.86

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Solution

The fourth proportional to 391.16, 586.55 and 159.86 is: 239.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.16 : 586.55 = 159.86 : x
  2. Step 2: Convert to fraction form
    391.16/586.55 = 159.86/x
  3. Step 3: Cross multiply
    391.16x = 586.55 × 159.86
  4. Step 4: Simplify right side
    391.16x = 93,762.15
  5. Step 5: Solve for x
    x = 93,762.15/391.16
  6. Step 6: Final answer
    x = 239.71

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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.