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Finding the Fourth Proportional to 639.31, 881.36 and 540.67

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Solution

The fourth proportional to 639.31, 881.36 and 540.67 is: 745.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.31 : 881.36 = 540.67 : x
  2. Step 2: Convert to fraction form
    639.31/881.36 = 540.67/x
  3. Step 3: Cross multiply
    639.31x = 881.36 × 540.67
  4. Step 4: Simplify right side
    639.31x = 476,522.21
  5. Step 5: Solve for x
    x = 476,522.21/639.31
  6. Step 6: Final answer
    x = 745.37

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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.