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Finding the Fourth Proportional to 1,223.25, 1,687.68 and 726.05

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Solution

The fourth proportional to 1,223.25, 1,687.68 and 726.05 is: 1,001.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.25 : 1,687.68 = 726.05 : x
  2. Step 2: Convert to fraction form
    1,223.25/1,687.68 = 726.05/x
  3. Step 3: Cross multiply
    1,223.25x = 1,687.68 × 726.05
  4. Step 4: Simplify right side
    1,223.25x = 1,225,331.63
  5. Step 5: Solve for x
    x = 1,225,331.63/1,223.25
  6. Step 6: Final answer
    x = 1,001.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.