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Finding the Fourth Proportional to 726.95, 1,089.41 and 618.31

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Solution

The fourth proportional to 726.95, 1,089.41 and 618.31 is: 926.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.95 : 1,089.41 = 618.31 : x
  2. Step 2: Convert to fraction form
    726.95/1,089.41 = 618.31/x
  3. Step 3: Cross multiply
    726.95x = 1,089.41 × 618.31
  4. Step 4: Simplify right side
    726.95x = 673,591.37
  5. Step 5: Solve for x
    x = 673,591.37/726.95
  6. Step 6: Final answer
    x = 926.60

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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.