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Finding the Fourth Proportional to 1,309.27, 1,963.19 and 649.69

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Solution

The fourth proportional to 1,309.27, 1,963.19 and 649.69 is: 974.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.27 : 1,963.19 = 649.69 : x
  2. Step 2: Convert to fraction form
    1,309.27/1,963.19 = 649.69/x
  3. Step 3: Cross multiply
    1,309.27x = 1,963.19 × 649.69
  4. Step 4: Simplify right side
    1,309.27x = 1,275,464.71
  5. Step 5: Solve for x
    x = 1,275,464.71/1,309.27
  6. Step 6: Final answer
    x = 974.18

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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.