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Finding the Fourth Proportional to 759.80, 1,139.70 and 727.40

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Solution

The fourth proportional to 759.80, 1,139.70 and 727.40 is: 1,091.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.80 : 1,139.70 = 727.40 : x
  2. Step 2: Convert to fraction form
    759.80/1,139.70 = 727.40/x
  3. Step 3: Cross multiply
    759.80x = 1,139.70 × 727.40
  4. Step 4: Simplify right side
    759.80x = 829,017.78
  5. Step 5: Solve for x
    x = 829,017.78/759.80
  6. Step 6: Final answer
    x = 1,091.10

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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.