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Finding the Fourth Proportional to 918.54, 1,377.81 and 269.27

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Solution

The fourth proportional to 918.54, 1,377.81 and 269.27 is: 403.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.54 : 1,377.81 = 269.27 : x
  2. Step 2: Convert to fraction form
    918.54/1,377.81 = 269.27/x
  3. Step 3: Cross multiply
    918.54x = 1,377.81 × 269.27
  4. Step 4: Simplify right side
    918.54x = 371,008.93
  5. Step 5: Solve for x
    x = 371,008.93/918.54
  6. Step 6: Final answer
    x = 403.91

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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.