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Finding the Fourth Proportional to 391.45, 587.25 and 117.53

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Solution

The fourth proportional to 391.45, 587.25 and 117.53 is: 176.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.45 : 587.25 = 117.53 : x
  2. Step 2: Convert to fraction form
    391.45/587.25 = 117.53/x
  3. Step 3: Cross multiply
    391.45x = 587.25 × 117.53
  4. Step 4: Simplify right side
    391.45x = 69,019.49
  5. Step 5: Solve for x
    x = 69,019.49/391.45
  6. Step 6: Final answer
    x = 176.32

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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.