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Finding the Fourth Proportional to 324.85, 487.66 and 256.42

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Solution

The fourth proportional to 324.85, 487.66 and 256.42 is: 384.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.85 : 487.66 = 256.42 : x
  2. Step 2: Convert to fraction form
    324.85/487.66 = 256.42/x
  3. Step 3: Cross multiply
    324.85x = 487.66 × 256.42
  4. Step 4: Simplify right side
    324.85x = 125,044.50
  5. Step 5: Solve for x
    x = 125,044.50/324.85
  6. Step 6: Final answer
    x = 384.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.