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Finding the Fourth Proportional to 324.98, 487.50 and 139.94

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Solution

The fourth proportional to 324.98, 487.50 and 139.94 is: 209.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.98 : 487.50 = 139.94 : x
  2. Step 2: Convert to fraction form
    324.98/487.50 = 139.94/x
  3. Step 3: Cross multiply
    324.98x = 487.50 × 139.94
  4. Step 4: Simplify right side
    324.98x = 68,220.75
  5. Step 5: Solve for x
    x = 68,220.75/324.98
  6. Step 6: Final answer
    x = 209.92

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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.