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Finding the Fourth Proportional to 518.56, 715.52 and 311.52

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Solution

The fourth proportional to 518.56, 715.52 and 311.52 is: 429.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.56 : 715.52 = 311.52 : x
  2. Step 2: Convert to fraction form
    518.56/715.52 = 311.52/x
  3. Step 3: Cross multiply
    518.56x = 715.52 × 311.52
  4. Step 4: Simplify right side
    518.56x = 222,898.79
  5. Step 5: Solve for x
    x = 222,898.79/518.56
  6. Step 6: Final answer
    x = 429.84

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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.