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Finding the Fourth Proportional to 918.95, 1,378.42 and 269.73

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Solution

The fourth proportional to 918.95, 1,378.42 and 269.73 is: 404.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.95 : 1,378.42 = 269.73 : x
  2. Step 2: Convert to fraction form
    918.95/1,378.42 = 269.73/x
  3. Step 3: Cross multiply
    918.95x = 1,378.42 × 269.73
  4. Step 4: Simplify right side
    918.95x = 371,800.55
  5. Step 5: Solve for x
    x = 371,800.55/918.95
  6. Step 6: Final answer
    x = 404.60

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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.