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Finding the Fourth Proportional to 801.24, 1,200.78 and 415.68

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Solution

The fourth proportional to 801.24, 1,200.78 and 415.68 is: 622.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.24 : 1,200.78 = 415.68 : x
  2. Step 2: Convert to fraction form
    801.24/1,200.78 = 415.68/x
  3. Step 3: Cross multiply
    801.24x = 1,200.78 × 415.68
  4. Step 4: Simplify right side
    801.24x = 499,140.23
  5. Step 5: Solve for x
    x = 499,140.23/801.24
  6. Step 6: Final answer
    x = 622.96

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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.