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Finding the Fourth Proportional to 391.69, 587.76 and 148.21

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Solution

The fourth proportional to 391.69, 587.76 and 148.21 is: 222.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.69 : 587.76 = 148.21 : x
  2. Step 2: Convert to fraction form
    391.69/587.76 = 148.21/x
  3. Step 3: Cross multiply
    391.69x = 587.76 × 148.21
  4. Step 4: Simplify right side
    391.69x = 87,111.91
  5. Step 5: Solve for x
    x = 87,111.91/391.69
  6. Step 6: Final answer
    x = 222.40

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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.