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Finding the Fourth Proportional to 726.29, 1,089.58 and 379.78

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Solution

The fourth proportional to 726.29, 1,089.58 and 379.78 is: 569.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.29 : 1,089.58 = 379.78 : x
  2. Step 2: Convert to fraction form
    726.29/1,089.58 = 379.78/x
  3. Step 3: Cross multiply
    726.29x = 1,089.58 × 379.78
  4. Step 4: Simplify right side
    726.29x = 413,800.69
  5. Step 5: Solve for x
    x = 413,800.69/726.29
  6. Step 6: Final answer
    x = 569.75

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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.