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Finding the Fourth Proportional to 81.42, 122.01 and 57.00

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Solution

The fourth proportional to 81.42, 122.01 and 57.00 is: 85.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.42 : 122.01 = 57.00 : x
  2. Step 2: Convert to fraction form
    81.42/122.01 = 57.00/x
  3. Step 3: Cross multiply
    81.42x = 122.01 × 57.00
  4. Step 4: Simplify right side
    81.42x = 6,954.81
  5. Step 5: Solve for x
    x = 6,954.81/81.42
  6. Step 6: Final answer
    x = 85.42

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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.