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Finding the Fourth Proportional to 726.40, 1,087.20 and 668.80

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Solution

The fourth proportional to 726.40, 1,087.20 and 668.80 is: 1,000.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.40 : 1,087.20 = 668.80 : x
  2. Step 2: Convert to fraction form
    726.40/1,087.20 = 668.80/x
  3. Step 3: Cross multiply
    726.40x = 1,087.20 × 668.80
  4. Step 4: Simplify right side
    726.40x = 727,119.36
  5. Step 5: Solve for x
    x = 727,119.36/726.40
  6. Step 6: Final answer
    x = 1,000.99

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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.