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Finding the Fourth Proportional to 514.99, 772.49 and 411.79

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Solution

The fourth proportional to 514.99, 772.49 and 411.79 is: 617.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.99 : 772.49 = 411.79 : x
  2. Step 2: Convert to fraction form
    514.99/772.49 = 411.79/x
  3. Step 3: Cross multiply
    514.99x = 772.49 × 411.79
  4. Step 4: Simplify right side
    514.99x = 318,103.66
  5. Step 5: Solve for x
    x = 318,103.66/514.99
  6. Step 6: Final answer
    x = 617.69

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Double scale
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Similar ratio
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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.