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Finding the Fourth Proportional to 85.94, 128.22 and 85.34

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Solution

The fourth proportional to 85.94, 128.22 and 85.34 is: 127.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.94 : 128.22 = 85.34 : x
  2. Step 2: Convert to fraction form
    85.94/128.22 = 85.34/x
  3. Step 3: Cross multiply
    85.94x = 128.22 × 85.34
  4. Step 4: Simplify right side
    85.94x = 10,941.65
  5. Step 5: Solve for x
    x = 10,941.65/85.94
  6. Step 6: Final answer
    x = 127.31

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These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.