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Finding the Fourth Proportional to 517.20, 713.44 and 307.31

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Solution

The fourth proportional to 517.20, 713.44 and 307.31 is: 423.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.20 : 713.44 = 307.31 : x
  2. Step 2: Convert to fraction form
    517.20/713.44 = 307.31/x
  3. Step 3: Cross multiply
    517.20x = 713.44 × 307.31
  4. Step 4: Simplify right side
    517.20x = 219,247.25
  5. Step 5: Solve for x
    x = 219,247.25/517.20
  6. Step 6: Final answer
    x = 423.91

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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.