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Finding the Fourth Proportional to 515.79, 711.89 and 406.11

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Solution

The fourth proportional to 515.79, 711.89 and 406.11 is: 560.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.79 : 711.89 = 406.11 : x
  2. Step 2: Convert to fraction form
    515.79/711.89 = 406.11/x
  3. Step 3: Cross multiply
    515.79x = 711.89 × 406.11
  4. Step 4: Simplify right side
    515.79x = 289,103.62
  5. Step 5: Solve for x
    x = 289,103.62/515.79
  6. Step 6: Final answer
    x = 560.51

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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.