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Finding the Fourth Proportional to 753.40, 1,129.38 and 266.11

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Solution

The fourth proportional to 753.40, 1,129.38 and 266.11 is: 398.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.40 : 1,129.38 = 266.11 : x
  2. Step 2: Convert to fraction form
    753.40/1,129.38 = 266.11/x
  3. Step 3: Cross multiply
    753.40x = 1,129.38 × 266.11
  4. Step 4: Simplify right side
    753.40x = 300,539.31
  5. Step 5: Solve for x
    x = 300,539.31/753.40
  6. Step 6: Final answer
    x = 398.91

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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.