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Finding the Fourth Proportional to 85.76, 128.48 and 50.95

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Solution

The fourth proportional to 85.76, 128.48 and 50.95 is: 76.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.76 : 128.48 = 50.95 : x
  2. Step 2: Convert to fraction form
    85.76/128.48 = 50.95/x
  3. Step 3: Cross multiply
    85.76x = 128.48 × 50.95
  4. Step 4: Simplify right side
    85.76x = 6,545.80
  5. Step 5: Solve for x
    x = 6,545.80/85.76
  6. Step 6: Final answer
    x = 76.33

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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.