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Finding the Fourth Proportional to 611.27, 915.60 and 480.65

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Solution

The fourth proportional to 611.27, 915.60 and 480.65 is: 719.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.27 : 915.60 = 480.65 : x
  2. Step 2: Convert to fraction form
    611.27/915.60 = 480.65/x
  3. Step 3: Cross multiply
    611.27x = 915.60 × 480.65
  4. Step 4: Simplify right side
    611.27x = 440,078.56
  5. Step 5: Solve for x
    x = 440,078.56/611.27
  6. Step 6: Final answer
    x = 719.95

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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.