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Finding the Fourth Proportional to 85.43, 128.17 and 27.66

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Solution

The fourth proportional to 85.43, 128.17 and 27.66 is: 41.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.43 : 128.17 = 27.66 : x
  2. Step 2: Convert to fraction form
    85.43/128.17 = 27.66/x
  3. Step 3: Cross multiply
    85.43x = 128.17 × 27.66
  4. Step 4: Simplify right side
    85.43x = 3,545.53
  5. Step 5: Solve for x
    x = 3,545.53/85.43
  6. Step 6: Final answer
    x = 41.50

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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.