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Finding the Fourth Proportional to 391.16, 586.56 and 117.20

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Solution

The fourth proportional to 391.16, 586.56 and 117.20 is: 175.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.16 : 586.56 = 117.20 : x
  2. Step 2: Convert to fraction form
    391.16/586.56 = 117.20/x
  3. Step 3: Cross multiply
    391.16x = 586.56 × 117.20
  4. Step 4: Simplify right side
    391.16x = 68,744.54
  5. Step 5: Solve for x
    x = 68,744.54/391.16
  6. Step 6: Final answer
    x = 175.75

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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.