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Finding the Fourth Proportional to 400.28, 600.36 and 143.78

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Solution

The fourth proportional to 400.28, 600.36 and 143.78 is: 215.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.28 : 600.36 = 143.78 : x
  2. Step 2: Convert to fraction form
    400.28/600.36 = 143.78/x
  3. Step 3: Cross multiply
    400.28x = 600.36 × 143.78
  4. Step 4: Simplify right side
    400.28x = 86,319.76
  5. Step 5: Solve for x
    x = 86,319.76/400.28
  6. Step 6: Final answer
    x = 215.65

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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.