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Finding the Fourth Proportional to 920.94, 1,381.03 and 726.31

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Solution

The fourth proportional to 920.94, 1,381.03 and 726.31 is: 1,089.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.94 : 1,381.03 = 726.31 : x
  2. Step 2: Convert to fraction form
    920.94/1,381.03 = 726.31/x
  3. Step 3: Cross multiply
    920.94x = 1,381.03 × 726.31
  4. Step 4: Simplify right side
    920.94x = 1,003,055.90
  5. Step 5: Solve for x
    x = 1,003,055.90/920.94
  6. Step 6: Final answer
    x = 1,089.17

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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.