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Finding the Fourth Proportional to 1,139.27, 1,707.68 and 813.65

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Solution

The fourth proportional to 1,139.27, 1,707.68 and 813.65 is: 1,219.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.27 : 1,707.68 = 813.65 : x
  2. Step 2: Convert to fraction form
    1,139.27/1,707.68 = 813.65/x
  3. Step 3: Cross multiply
    1,139.27x = 1,707.68 × 813.65
  4. Step 4: Simplify right side
    1,139.27x = 1,389,453.83
  5. Step 5: Solve for x
    x = 1,389,453.83/1,139.27
  6. Step 6: Final answer
    x = 1,219.60

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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.