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Finding the Fourth Proportional to 881.96, 1,216.50 and 648.68

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Solution

The fourth proportional to 881.96, 1,216.50 and 648.68 is: 894.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.96 : 1,216.50 = 648.68 : x
  2. Step 2: Convert to fraction form
    881.96/1,216.50 = 648.68/x
  3. Step 3: Cross multiply
    881.96x = 1,216.50 × 648.68
  4. Step 4: Simplify right side
    881.96x = 789,119.22
  5. Step 5: Solve for x
    x = 789,119.22/881.96
  6. Step 6: Final answer
    x = 894.73

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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.