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Finding the Fourth Proportional to 918.73, 1,378.10 and 269.47

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Solution

The fourth proportional to 918.73, 1,378.10 and 269.47 is: 404.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.73 : 1,378.10 = 269.47 : x
  2. Step 2: Convert to fraction form
    918.73/1,378.10 = 269.47/x
  3. Step 3: Cross multiply
    918.73x = 1,378.10 × 269.47
  4. Step 4: Simplify right side
    918.73x = 371,356.61
  5. Step 5: Solve for x
    x = 371,356.61/918.73
  6. Step 6: Final answer
    x = 404.21

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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.