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Finding the Fourth Proportional to 391.55, 587.34 and 157.28

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Solution

The fourth proportional to 391.55, 587.34 and 157.28 is: 235.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.55 : 587.34 = 157.28 : x
  2. Step 2: Convert to fraction form
    391.55/587.34 = 157.28/x
  3. Step 3: Cross multiply
    391.55x = 587.34 × 157.28
  4. Step 4: Simplify right side
    391.55x = 92,373.90
  5. Step 5: Solve for x
    x = 92,373.90/391.55
  6. Step 6: Final answer
    x = 235.92

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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.