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Finding the Fourth Proportional to 1,311.48, 1,966.86 and 726.28

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Solution

The fourth proportional to 1,311.48, 1,966.86 and 726.28 is: 1,089.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.48 : 1,966.86 = 726.28 : x
  2. Step 2: Convert to fraction form
    1,311.48/1,966.86 = 726.28/x
  3. Step 3: Cross multiply
    1,311.48x = 1,966.86 × 726.28
  4. Step 4: Simplify right side
    1,311.48x = 1,428,491.08
  5. Step 5: Solve for x
    x = 1,428,491.08/1,311.48
  6. Step 6: Final answer
    x = 1,089.22

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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.