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Finding the Fourth Proportional to 768.56, 1,151.80 and 421.37

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Solution

The fourth proportional to 768.56, 1,151.80 and 421.37 is: 631.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.56 : 1,151.80 = 421.37 : x
  2. Step 2: Convert to fraction form
    768.56/1,151.80 = 421.37/x
  3. Step 3: Cross multiply
    768.56x = 1,151.80 × 421.37
  4. Step 4: Simplify right side
    768.56x = 485,333.97
  5. Step 5: Solve for x
    x = 485,333.97/768.56
  6. Step 6: Final answer
    x = 631.48

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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.