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Finding the Fourth Proportional to 1,223.55, 1,688.34 and 726.09

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Solution

The fourth proportional to 1,223.55, 1,688.34 and 726.09 is: 1,001.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.55 : 1,688.34 = 726.09 : x
  2. Step 2: Convert to fraction form
    1,223.55/1,688.34 = 726.09/x
  3. Step 3: Cross multiply
    1,223.55x = 1,688.34 × 726.09
  4. Step 4: Simplify right side
    1,223.55x = 1,225,883.18
  5. Step 5: Solve for x
    x = 1,225,883.18/1,223.55
  6. Step 6: Final answer
    x = 1,001.91

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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.