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Finding the Fourth Proportional to 391.55, 587.33 and 117.67

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Solution

The fourth proportional to 391.55, 587.33 and 117.67 is: 176.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.55 : 587.33 = 117.67 : x
  2. Step 2: Convert to fraction form
    391.55/587.33 = 117.67/x
  3. Step 3: Cross multiply
    391.55x = 587.33 × 117.67
  4. Step 4: Simplify right side
    391.55x = 69,108.17
  5. Step 5: Solve for x
    x = 69,108.17/391.55
  6. Step 6: Final answer
    x = 176.50

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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.