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Finding the Fourth Proportional to 885.27, 1,328.39 and 422.98

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Solution

The fourth proportional to 885.27, 1,328.39 and 422.98 is: 634.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.27 : 1,328.39 = 422.98 : x
  2. Step 2: Convert to fraction form
    885.27/1,328.39 = 422.98/x
  3. Step 3: Cross multiply
    885.27x = 1,328.39 × 422.98
  4. Step 4: Simplify right side
    885.27x = 561,887.30
  5. Step 5: Solve for x
    x = 561,887.30/885.27
  6. Step 6: Final answer
    x = 634.71

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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.