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Finding the Fourth Proportional to 1,324.50, 1,987.47 and 640.50

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Solution

The fourth proportional to 1,324.50, 1,987.47 and 640.50 is: 961.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.50 : 1,987.47 = 640.50 : x
  2. Step 2: Convert to fraction form
    1,324.50/1,987.47 = 640.50/x
  3. Step 3: Cross multiply
    1,324.50x = 1,987.47 × 640.50
  4. Step 4: Simplify right side
    1,324.50x = 1,272,974.54
  5. Step 5: Solve for x
    x = 1,272,974.54/1,324.50
  6. Step 6: Final answer
    x = 961.10

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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.