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Finding the Fourth Proportional to 391.66, 587.22 and 261.70

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Solution

The fourth proportional to 391.66, 587.22 and 261.70 is: 392.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.66 : 587.22 = 261.70 : x
  2. Step 2: Convert to fraction form
    391.66/587.22 = 261.70/x
  3. Step 3: Cross multiply
    391.66x = 587.22 × 261.70
  4. Step 4: Simplify right side
    391.66x = 153,675.47
  5. Step 5: Solve for x
    x = 153,675.47/391.66
  6. Step 6: Final answer
    x = 392.37

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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.