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Finding the Fourth Proportional to 391.81, 586.96 and 261.43

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Solution

The fourth proportional to 391.81, 586.96 and 261.43 is: 391.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.81 : 586.96 = 261.43 : x
  2. Step 2: Convert to fraction form
    391.81/586.96 = 261.43/x
  3. Step 3: Cross multiply
    391.81x = 586.96 × 261.43
  4. Step 4: Simplify right side
    391.81x = 153,448.95
  5. Step 5: Solve for x
    x = 153,448.95/391.81
  6. Step 6: Final answer
    x = 391.64

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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.