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Finding the Fourth Proportional to 204.72, 307.05 and 87.63

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Solution

The fourth proportional to 204.72, 307.05 and 87.63 is: 131.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.72 : 307.05 = 87.63 : x
  2. Step 2: Convert to fraction form
    204.72/307.05 = 87.63/x
  3. Step 3: Cross multiply
    204.72x = 307.05 × 87.63
  4. Step 4: Simplify right side
    204.72x = 26,906.79
  5. Step 5: Solve for x
    x = 26,906.79/204.72
  6. Step 6: Final answer
    x = 131.43

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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.