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Finding the Fourth Proportional to 427.36, 641.01 and 138.77

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Solution

The fourth proportional to 427.36, 641.01 and 138.77 is: 208.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.36 : 641.01 = 138.77 : x
  2. Step 2: Convert to fraction form
    427.36/641.01 = 138.77/x
  3. Step 3: Cross multiply
    427.36x = 641.01 × 138.77
  4. Step 4: Simplify right side
    427.36x = 88,952.96
  5. Step 5: Solve for x
    x = 88,952.96/427.36
  6. Step 6: Final answer
    x = 208.15

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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.