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Finding the Fourth Proportional to 726.25, 1,089.12 and 315.37

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Solution

The fourth proportional to 726.25, 1,089.12 and 315.37 is: 472.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.25 : 1,089.12 = 315.37 : x
  2. Step 2: Convert to fraction form
    726.25/1,089.12 = 315.37/x
  3. Step 3: Cross multiply
    726.25x = 1,089.12 × 315.37
  4. Step 4: Simplify right side
    726.25x = 343,474.20
  5. Step 5: Solve for x
    x = 343,474.20/726.25
  6. Step 6: Final answer
    x = 472.94

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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.