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Finding the Fourth Proportional to 854.66, 1,280.68 and 415.44

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Solution

The fourth proportional to 854.66, 1,280.68 and 415.44 is: 622.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.66 : 1,280.68 = 415.44 : x
  2. Step 2: Convert to fraction form
    854.66/1,280.68 = 415.44/x
  3. Step 3: Cross multiply
    854.66x = 1,280.68 × 415.44
  4. Step 4: Simplify right side
    854.66x = 532,045.70
  5. Step 5: Solve for x
    x = 532,045.70/854.66
  6. Step 6: Final answer
    x = 622.52

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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.