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Finding the Fourth Proportional to 918.45, 1,377.90 and 269.15

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Solution

The fourth proportional to 918.45, 1,377.90 and 269.15 is: 403.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.45 : 1,377.90 = 269.15 : x
  2. Step 2: Convert to fraction form
    918.45/1,377.90 = 269.15/x
  3. Step 3: Cross multiply
    918.45x = 1,377.90 × 269.15
  4. Step 4: Simplify right side
    918.45x = 370,854.90
  5. Step 5: Solve for x
    x = 370,854.90/918.45
  6. Step 6: Final answer
    x = 403.78

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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.