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Finding the Fourth Proportional to 517.28, 775.46 and 209.40

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Solution

The fourth proportional to 517.28, 775.46 and 209.40 is: 313.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.28 : 775.46 = 209.40 : x
  2. Step 2: Convert to fraction form
    517.28/775.46 = 209.40/x
  3. Step 3: Cross multiply
    517.28x = 775.46 × 209.40
  4. Step 4: Simplify right side
    517.28x = 162,381.32
  5. Step 5: Solve for x
    x = 162,381.32/517.28
  6. Step 6: Final answer
    x = 313.91

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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.