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Finding the Fourth Proportional to 518.40, 715.28 and 331.79

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Solution

The fourth proportional to 518.40, 715.28 and 331.79 is: 457.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.40 : 715.28 = 331.79 : x
  2. Step 2: Convert to fraction form
    518.40/715.28 = 331.79/x
  3. Step 3: Cross multiply
    518.40x = 715.28 × 331.79
  4. Step 4: Simplify right side
    518.40x = 237,317.52
  5. Step 5: Solve for x
    x = 237,317.52/518.40
  6. Step 6: Final answer
    x = 457.79

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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.