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Finding the Fourth Proportional to 1,324.65, 1,987.20 and 400.20

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Solution

The fourth proportional to 1,324.65, 1,987.20 and 400.20 is: 600.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.65 : 1,987.20 = 400.20 : x
  2. Step 2: Convert to fraction form
    1,324.65/1,987.20 = 400.20/x
  3. Step 3: Cross multiply
    1,324.65x = 1,987.20 × 400.20
  4. Step 4: Simplify right side
    1,324.65x = 795,277.44
  5. Step 5: Solve for x
    x = 795,277.44/1,324.65
  6. Step 6: Final answer
    x = 600.37

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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.