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Finding the Fourth Proportional to 517.52, 715.43 and 394.81

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Solution

The fourth proportional to 517.52, 715.43 and 394.81 is: 545.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.52 : 715.43 = 394.81 : x
  2. Step 2: Convert to fraction form
    517.52/715.43 = 394.81/x
  3. Step 3: Cross multiply
    517.52x = 715.43 × 394.81
  4. Step 4: Simplify right side
    517.52x = 282,458.12
  5. Step 5: Solve for x
    x = 282,458.12/517.52
  6. Step 6: Final answer
    x = 545.79

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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.