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Finding the Fourth Proportional to 767.44, 1,150.87 and 421.03

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Solution

The fourth proportional to 767.44, 1,150.87 and 421.03 is: 631.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.44 : 1,150.87 = 421.03 : x
  2. Step 2: Convert to fraction form
    767.44/1,150.87 = 421.03/x
  3. Step 3: Cross multiply
    767.44x = 1,150.87 × 421.03
  4. Step 4: Simplify right side
    767.44x = 484,550.80
  5. Step 5: Solve for x
    x = 484,550.80/767.44
  6. Step 6: Final answer
    x = 631.39

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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.