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Finding the Fourth Proportional to 391.28, 587.01 and 117.36

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Solution

The fourth proportional to 391.28, 587.01 and 117.36 is: 176.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.28 : 587.01 = 117.36 : x
  2. Step 2: Convert to fraction form
    391.28/587.01 = 117.36/x
  3. Step 3: Cross multiply
    391.28x = 587.01 × 117.36
  4. Step 4: Simplify right side
    391.28x = 68,891.49
  5. Step 5: Solve for x
    x = 68,891.49/391.28
  6. Step 6: Final answer
    x = 176.07

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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.