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Finding the Fourth Proportional to 759.49, 1,139.23 and 272.58

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Solution

The fourth proportional to 759.49, 1,139.23 and 272.58 is: 408.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.49 : 1,139.23 = 272.58 : x
  2. Step 2: Convert to fraction form
    759.49/1,139.23 = 272.58/x
  3. Step 3: Cross multiply
    759.49x = 1,139.23 × 272.58
  4. Step 4: Simplify right side
    759.49x = 310,527.38
  5. Step 5: Solve for x
    x = 310,527.38/759.49
  6. Step 6: Final answer
    x = 408.86

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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.