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Finding the Fourth Proportional to 330.79, 495.69 and 261.53

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Solution

The fourth proportional to 330.79, 495.69 and 261.53 is: 391.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.79 : 495.69 = 261.53 : x
  2. Step 2: Convert to fraction form
    330.79/495.69 = 261.53/x
  3. Step 3: Cross multiply
    330.79x = 495.69 × 261.53
  4. Step 4: Simplify right side
    330.79x = 129,637.81
  5. Step 5: Solve for x
    x = 129,637.81/330.79
  6. Step 6: Final answer
    x = 391.90

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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.