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Finding the Fourth Proportional to 759.79, 1,139.67 and 272.80

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Solution

The fourth proportional to 759.79, 1,139.67 and 272.80 is: 409.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.79 : 1,139.67 = 272.80 : x
  2. Step 2: Convert to fraction form
    759.79/1,139.67 = 272.80/x
  3. Step 3: Cross multiply
    759.79x = 1,139.67 × 272.80
  4. Step 4: Simplify right side
    759.79x = 310,901.98
  5. Step 5: Solve for x
    x = 310,901.98/759.79
  6. Step 6: Final answer
    x = 409.19

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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.