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Finding the Fourth Proportional to 726.11, 1,089.47 and 518.12

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Solution

The fourth proportional to 726.11, 1,089.47 and 518.12 is: 777.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.11 : 1,089.47 = 518.12 : x
  2. Step 2: Convert to fraction form
    726.11/1,089.47 = 518.12/x
  3. Step 3: Cross multiply
    726.11x = 1,089.47 × 518.12
  4. Step 4: Simplify right side
    726.11x = 564,472.04
  5. Step 5: Solve for x
    x = 564,472.04/726.11
  6. Step 6: Final answer
    x = 777.40

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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.