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Finding the Fourth Proportional to 1,139.27, 1,708.70 and 480.94

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Solution

The fourth proportional to 1,139.27, 1,708.70 and 480.94 is: 721.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.27 : 1,708.70 = 480.94 : x
  2. Step 2: Convert to fraction form
    1,139.27/1,708.70 = 480.94/x
  3. Step 3: Cross multiply
    1,139.27x = 1,708.70 × 480.94
  4. Step 4: Simplify right side
    1,139.27x = 821,775.50
  5. Step 5: Solve for x
    x = 821,775.50/1,139.27
  6. Step 6: Final answer
    x = 721.32

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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.