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Finding the Fourth Proportional to 517.29, 712.47 and 478.36

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Solution

The fourth proportional to 517.29, 712.47 and 478.36 is: 658.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.29 : 712.47 = 478.36 : x
  2. Step 2: Convert to fraction form
    517.29/712.47 = 478.36/x
  3. Step 3: Cross multiply
    517.29x = 712.47 × 478.36
  4. Step 4: Simplify right side
    517.29x = 340,817.15
  5. Step 5: Solve for x
    x = 340,817.15/517.29
  6. Step 6: Final answer
    x = 658.85

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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.