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Finding the Fourth Proportional to 726.67, 1,089.81 and 315.71

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Solution

The fourth proportional to 726.67, 1,089.81 and 315.71 is: 473.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.67 : 1,089.81 = 315.71 : x
  2. Step 2: Convert to fraction form
    726.67/1,089.81 = 315.71/x
  3. Step 3: Cross multiply
    726.67x = 1,089.81 × 315.71
  4. Step 4: Simplify right side
    726.67x = 344,063.92
  5. Step 5: Solve for x
    x = 344,063.92/726.67
  6. Step 6: Final answer
    x = 473.48

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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.