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Finding the Fourth Proportional to 753.40, 1,129.71 and 266.38

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Solution

The fourth proportional to 753.40, 1,129.71 and 266.38 is: 399.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.40 : 1,129.71 = 266.38 : x
  2. Step 2: Convert to fraction form
    753.40/1,129.71 = 266.38/x
  3. Step 3: Cross multiply
    753.40x = 1,129.71 × 266.38
  4. Step 4: Simplify right side
    753.40x = 300,932.15
  5. Step 5: Solve for x
    x = 300,932.15/753.40
  6. Step 6: Final answer
    x = 399.43

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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.