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Finding the Fourth Proportional to 391.98, 589.18 and 248.60

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Solution

The fourth proportional to 391.98, 589.18 and 248.60 is: 373.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.98 : 589.18 = 248.60 : x
  2. Step 2: Convert to fraction form
    391.98/589.18 = 248.60/x
  3. Step 3: Cross multiply
    391.98x = 589.18 × 248.60
  4. Step 4: Simplify right side
    391.98x = 146,470.15
  5. Step 5: Solve for x
    x = 146,470.15/391.98
  6. Step 6: Final answer
    x = 373.67

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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.