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Finding the Fourth Proportional to 854.72, 1,281.12 and 422.18

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Solution

The fourth proportional to 854.72, 1,281.12 and 422.18 is: 632.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.72 : 1,281.12 = 422.18 : x
  2. Step 2: Convert to fraction form
    854.72/1,281.12 = 422.18/x
  3. Step 3: Cross multiply
    854.72x = 1,281.12 × 422.18
  4. Step 4: Simplify right side
    854.72x = 540,863.24
  5. Step 5: Solve for x
    x = 540,863.24/854.72
  6. Step 6: Final answer
    x = 632.80

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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.