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Finding the Fourth Proportional to 89.70, 134.31 and 74.43

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Solution

The fourth proportional to 89.70, 134.31 and 74.43 is: 111.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.70 : 134.31 = 74.43 : x
  2. Step 2: Convert to fraction form
    89.70/134.31 = 74.43/x
  3. Step 3: Cross multiply
    89.70x = 134.31 × 74.43
  4. Step 4: Simplify right side
    89.70x = 9,996.69
  5. Step 5: Solve for x
    x = 9,996.69/89.70
  6. Step 6: Final answer
    x = 111.45

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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.