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Finding the Fourth Proportional to 759.91, 1,139.86 and 266.28

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Solution

The fourth proportional to 759.91, 1,139.86 and 266.28 is: 399.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.91 : 1,139.86 = 266.28 : x
  2. Step 2: Convert to fraction form
    759.91/1,139.86 = 266.28/x
  3. Step 3: Cross multiply
    759.91x = 1,139.86 × 266.28
  4. Step 4: Simplify right side
    759.91x = 303,521.92
  5. Step 5: Solve for x
    x = 303,521.92/759.91
  6. Step 6: Final answer
    x = 399.42

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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.