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Finding the Fourth Proportional to 726.72, 1,089.12 and 380.34

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Solution

The fourth proportional to 726.72, 1,089.12 and 380.34 is: 570.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.72 : 1,089.12 = 380.34 : x
  2. Step 2: Convert to fraction form
    726.72/1,089.12 = 380.34/x
  3. Step 3: Cross multiply
    726.72x = 1,089.12 × 380.34
  4. Step 4: Simplify right side
    726.72x = 414,235.90
  5. Step 5: Solve for x
    x = 414,235.90/726.72
  6. Step 6: Final answer
    x = 570.01

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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.