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Finding the Fourth Proportional to 391.48, 587.21 and 117.57

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Solution

The fourth proportional to 391.48, 587.21 and 117.57 is: 176.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.48 : 587.21 = 117.57 : x
  2. Step 2: Convert to fraction form
    391.48/587.21 = 117.57/x
  3. Step 3: Cross multiply
    391.48x = 587.21 × 117.57
  4. Step 4: Simplify right side
    391.48x = 69,040.56
  5. Step 5: Solve for x
    x = 69,040.56/391.48
  6. Step 6: Final answer
    x = 176.36

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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.