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Finding the Fourth Proportional to 881.86, 1,217.37 and 661.54

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Solution

The fourth proportional to 881.86, 1,217.37 and 661.54 is: 913.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.86 : 1,217.37 = 661.54 : x
  2. Step 2: Convert to fraction form
    881.86/1,217.37 = 661.54/x
  3. Step 3: Cross multiply
    881.86x = 1,217.37 × 661.54
  4. Step 4: Simplify right side
    881.86x = 805,338.95
  5. Step 5: Solve for x
    x = 805,338.95/881.86
  6. Step 6: Final answer
    x = 913.23

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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.