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Finding the Fourth Proportional to 724.21, 1,086.31 and 176.39

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Solution

The fourth proportional to 724.21, 1,086.31 and 176.39 is: 264.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.21 : 1,086.31 = 176.39 : x
  2. Step 2: Convert to fraction form
    724.21/1,086.31 = 176.39/x
  3. Step 3: Cross multiply
    724.21x = 1,086.31 × 176.39
  4. Step 4: Simplify right side
    724.21x = 191,608.79
  5. Step 5: Solve for x
    x = 191,608.79/724.21
  6. Step 6: Final answer
    x = 264.58

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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.