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Finding the Fourth Proportional to 85.66, 128.43 and 62.75

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Solution

The fourth proportional to 85.66, 128.43 and 62.75 is: 94.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.66 : 128.43 = 62.75 : x
  2. Step 2: Convert to fraction form
    85.66/128.43 = 62.75/x
  3. Step 3: Cross multiply
    85.66x = 128.43 × 62.75
  4. Step 4: Simplify right side
    85.66x = 8,059.30
  5. Step 5: Solve for x
    x = 8,059.30/85.66
  6. Step 6: Final answer
    x = 94.09

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.