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Finding the Fourth Proportional to 759.69, 1,139.40 and 484.97

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Solution

The fourth proportional to 759.69, 1,139.40 and 484.97 is: 727.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.69 : 1,139.40 = 484.97 : x
  2. Step 2: Convert to fraction form
    759.69/1,139.40 = 484.97/x
  3. Step 3: Cross multiply
    759.69x = 1,139.40 × 484.97
  4. Step 4: Simplify right side
    759.69x = 552,569.12
  5. Step 5: Solve for x
    x = 552,569.12/759.69
  6. Step 6: Final answer
    x = 727.36

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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.