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Finding the Fourth Proportional to 881.05, 1,322.04 and 639.57

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Solution

The fourth proportional to 881.05, 1,322.04 and 639.57 is: 959.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.05 : 1,322.04 = 639.57 : x
  2. Step 2: Convert to fraction form
    881.05/1,322.04 = 639.57/x
  3. Step 3: Cross multiply
    881.05x = 1,322.04 × 639.57
  4. Step 4: Simplify right side
    881.05x = 845,537.12
  5. Step 5: Solve for x
    x = 845,537.12/881.05
  6. Step 6: Final answer
    x = 959.69

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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.