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Finding the Fourth Proportional to 726.93, 1,091.72 and 380.50

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Solution

The fourth proportional to 726.93, 1,091.72 and 380.50 is: 571.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.93 : 1,091.72 = 380.50 : x
  2. Step 2: Convert to fraction form
    726.93/1,091.72 = 380.50/x
  3. Step 3: Cross multiply
    726.93x = 1,091.72 × 380.50
  4. Step 4: Simplify right side
    726.93x = 415,397.68
  5. Step 5: Solve for x
    x = 415,397.68/726.93
  6. Step 6: Final answer
    x = 571.44

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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.