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Finding the Fourth Proportional to 919.30, 1,378.88 and 269.98

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Solution

The fourth proportional to 919.30, 1,378.88 and 269.98 is: 404.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.30 : 1,378.88 = 269.98 : x
  2. Step 2: Convert to fraction form
    919.30/1,378.88 = 269.98/x
  3. Step 3: Cross multiply
    919.30x = 1,378.88 × 269.98
  4. Step 4: Simplify right side
    919.30x = 372,261.78
  5. Step 5: Solve for x
    x = 372,261.78/919.30
  6. Step 6: Final answer
    x = 404.94

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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.