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Finding the Fourth Proportional to 391.50, 540.30 and 275.34

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Solution

The fourth proportional to 391.50, 540.30 and 275.34 is: 379.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.50 : 540.30 = 275.34 : x
  2. Step 2: Convert to fraction form
    391.50/540.30 = 275.34/x
  3. Step 3: Cross multiply
    391.50x = 540.30 × 275.34
  4. Step 4: Simplify right side
    391.50x = 148,766.20
  5. Step 5: Solve for x
    x = 148,766.20/391.50
  6. Step 6: Final answer
    x = 379.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.