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Finding the Fourth Proportional to 391.18, 540.12 and 275.36

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Solution

The fourth proportional to 391.18, 540.12 and 275.36 is: 380.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.18 : 540.12 = 275.36 : x
  2. Step 2: Convert to fraction form
    391.18/540.12 = 275.36/x
  3. Step 3: Cross multiply
    391.18x = 540.12 × 275.36
  4. Step 4: Simplify right side
    391.18x = 148,727.44
  5. Step 5: Solve for x
    x = 148,727.44/391.18
  6. Step 6: Final answer
    x = 380.20

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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.