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Finding the Fourth Proportional to 910.50, 1,363.94 and 422.88

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Solution

The fourth proportional to 910.50, 1,363.94 and 422.88 is: 633.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.50 : 1,363.94 = 422.88 : x
  2. Step 2: Convert to fraction form
    910.50/1,363.94 = 422.88/x
  3. Step 3: Cross multiply
    910.50x = 1,363.94 × 422.88
  4. Step 4: Simplify right side
    910.50x = 576,782.95
  5. Step 5: Solve for x
    x = 576,782.95/910.50
  6. Step 6: Final answer
    x = 633.48

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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.