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Finding the Fourth Proportional to 881.02, 1,321.99 and 639.54

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Solution

The fourth proportional to 881.02, 1,321.99 and 639.54 is: 959.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.02 : 1,321.99 = 639.54 : x
  2. Step 2: Convert to fraction form
    881.02/1,321.99 = 639.54/x
  3. Step 3: Cross multiply
    881.02x = 1,321.99 × 639.54
  4. Step 4: Simplify right side
    881.02x = 845,462.29
  5. Step 5: Solve for x
    x = 845,462.29/881.02
  6. Step 6: Final answer
    x = 959.64

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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.