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Finding the Fourth Proportional to 391.60, 587.45 and 148.20

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Solution

The fourth proportional to 391.60, 587.45 and 148.20 is: 222.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.60 : 587.45 = 148.20 : x
  2. Step 2: Convert to fraction form
    391.60/587.45 = 148.20/x
  3. Step 3: Cross multiply
    391.60x = 587.45 × 148.20
  4. Step 4: Simplify right side
    391.60x = 87,057.15
  5. Step 5: Solve for x
    x = 87,057.15/391.60
  6. Step 6: Final answer
    x = 222.31

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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.