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Finding the Fourth Proportional to 853.87, 1,283.25 and 421.33

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Solution

The fourth proportional to 853.87, 1,283.25 and 421.33 is: 633.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.87 : 1,283.25 = 421.33 : x
  2. Step 2: Convert to fraction form
    853.87/1,283.25 = 421.33/x
  3. Step 3: Cross multiply
    853.87x = 1,283.25 × 421.33
  4. Step 4: Simplify right side
    853.87x = 540,671.72
  5. Step 5: Solve for x
    x = 540,671.72/853.87
  6. Step 6: Final answer
    x = 633.20

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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.