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Finding the Fourth Proportional to 85.95, 128.94 and 63.15

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Solution

The fourth proportional to 85.95, 128.94 and 63.15 is: 94.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.95 : 128.94 = 63.15 : x
  2. Step 2: Convert to fraction form
    85.95/128.94 = 63.15/x
  3. Step 3: Cross multiply
    85.95x = 128.94 × 63.15
  4. Step 4: Simplify right side
    85.95x = 8,142.56
  5. Step 5: Solve for x
    x = 8,142.56/85.95
  6. Step 6: Final answer
    x = 94.74

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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.