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Finding the Fourth Proportional to 753.18, 1,129.78 and 266.23

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Solution

The fourth proportional to 753.18, 1,129.78 and 266.23 is: 399.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.18 : 1,129.78 = 266.23 : x
  2. Step 2: Convert to fraction form
    753.18/1,129.78 = 266.23/x
  3. Step 3: Cross multiply
    753.18x = 1,129.78 × 266.23
  4. Step 4: Simplify right side
    753.18x = 300,781.33
  5. Step 5: Solve for x
    x = 300,781.33/753.18
  6. Step 6: Final answer
    x = 399.35

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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.