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Finding the Fourth Proportional to 515.72, 774.18 and 414.26

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Solution

The fourth proportional to 515.72, 774.18 and 414.26 is: 621.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.72 : 774.18 = 414.26 : x
  2. Step 2: Convert to fraction form
    515.72/774.18 = 414.26/x
  3. Step 3: Cross multiply
    515.72x = 774.18 × 414.26
  4. Step 4: Simplify right side
    515.72x = 320,711.81
  5. Step 5: Solve for x
    x = 320,711.81/515.72
  6. Step 6: Final answer
    x = 621.87

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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.