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Finding the Fourth Proportional to 753.37, 1,128.31 and 727.42

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Solution

The fourth proportional to 753.37, 1,128.31 and 727.42 is: 1,089.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.37 : 1,128.31 = 727.42 : x
  2. Step 2: Convert to fraction form
    753.37/1,128.31 = 727.42/x
  3. Step 3: Cross multiply
    753.37x = 1,128.31 × 727.42
  4. Step 4: Simplify right side
    753.37x = 820,755.26
  5. Step 5: Solve for x
    x = 820,755.26/753.37
  6. Step 6: Final answer
    x = 1,089.45

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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.