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Finding the Fourth Proportional to 726.87, 1,089.90 and 258.11

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Solution

The fourth proportional to 726.87, 1,089.90 and 258.11 is: 387.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.87 : 1,089.90 = 258.11 : x
  2. Step 2: Convert to fraction form
    726.87/1,089.90 = 258.11/x
  3. Step 3: Cross multiply
    726.87x = 1,089.90 × 258.11
  4. Step 4: Simplify right side
    726.87x = 281,314.09
  5. Step 5: Solve for x
    x = 281,314.09/726.87
  6. Step 6: Final answer
    x = 387.02

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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.