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Finding the Fourth Proportional to 639.06, 881.01 and 540.42

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Solution

The fourth proportional to 639.06, 881.01 and 540.42 is: 745.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.06 : 881.01 = 540.42 : x
  2. Step 2: Convert to fraction form
    639.06/881.01 = 540.42/x
  3. Step 3: Cross multiply
    639.06x = 881.01 × 540.42
  4. Step 4: Simplify right side
    639.06x = 476,115.42
  5. Step 5: Solve for x
    x = 476,115.42/639.06
  6. Step 6: Final answer
    x = 745.02

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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.