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Finding the Fourth Proportional to 909.97, 1,365.19 and 422.45

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Solution

The fourth proportional to 909.97, 1,365.19 and 422.45 is: 633.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.97 : 1,365.19 = 422.45 : x
  2. Step 2: Convert to fraction form
    909.97/1,365.19 = 422.45/x
  3. Step 3: Cross multiply
    909.97x = 1,365.19 × 422.45
  4. Step 4: Simplify right side
    909.97x = 576,724.52
  5. Step 5: Solve for x
    x = 576,724.52/909.97
  6. Step 6: Final answer
    x = 633.78

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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.