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Finding the Fourth Proportional to 918.11, 1,376.13 and 397.92

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Solution

The fourth proportional to 918.11, 1,376.13 and 397.92 is: 596.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.11 : 1,376.13 = 397.92 : x
  2. Step 2: Convert to fraction form
    918.11/1,376.13 = 397.92/x
  3. Step 3: Cross multiply
    918.11x = 1,376.13 × 397.92
  4. Step 4: Simplify right side
    918.11x = 547,589.65
  5. Step 5: Solve for x
    x = 547,589.65/918.11
  6. Step 6: Final answer
    x = 596.43

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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.