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Finding the Fourth Proportional to 768.44, 1,151.61 and 421.26

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Solution

The fourth proportional to 768.44, 1,151.61 and 421.26 is: 631.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.44 : 1,151.61 = 421.26 : x
  2. Step 2: Convert to fraction form
    768.44/1,151.61 = 421.26/x
  3. Step 3: Cross multiply
    768.44x = 1,151.61 × 421.26
  4. Step 4: Simplify right side
    768.44x = 485,127.23
  5. Step 5: Solve for x
    x = 485,127.23/768.44
  6. Step 6: Final answer
    x = 631.32

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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.