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Finding the Fourth Proportional to 726.89, 1,089.77 and 361.40

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Solution

The fourth proportional to 726.89, 1,089.77 and 361.40 is: 541.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.89 : 1,089.77 = 361.40 : x
  2. Step 2: Convert to fraction form
    726.89/1,089.77 = 361.40/x
  3. Step 3: Cross multiply
    726.89x = 1,089.77 × 361.40
  4. Step 4: Simplify right side
    726.89x = 393,838.33
  5. Step 5: Solve for x
    x = 393,838.33/726.89
  6. Step 6: Final answer
    x = 541.81

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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.