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Finding the Fourth Proportional to 391.77, 540.68 and 261

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Solution

The fourth proportional to 391.77, 540.68 and 261 is: 360.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.77 : 540.68 = 261 : x
  2. Step 2: Convert to fraction form
    391.77/540.68 = 261/x
  3. Step 3: Cross multiply
    391.77x = 540.68 × 261
  4. Step 4: Simplify right side
    391.77x = 141,116.18
  5. Step 5: Solve for x
    x = 141,116.18/391.77
  6. Step 6: Final answer
    x = 360.20

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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.