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Finding the Fourth Proportional to 881.39, 1,216.20 and 488.42

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Solution

The fourth proportional to 881.39, 1,216.20 and 488.42 is: 673.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.39 : 1,216.20 = 488.42 : x
  2. Step 2: Convert to fraction form
    881.39/1,216.20 = 488.42/x
  3. Step 3: Cross multiply
    881.39x = 1,216.20 × 488.42
  4. Step 4: Simplify right side
    881.39x = 594,010.01
  5. Step 5: Solve for x
    x = 594,010.01/881.39
  6. Step 6: Final answer
    x = 673.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.