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Finding the Fourth Proportional to 89.81, 134.78 and 35.71

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Solution

The fourth proportional to 89.81, 134.78 and 35.71 is: 53.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.81 : 134.78 = 35.71 : x
  2. Step 2: Convert to fraction form
    89.81/134.78 = 35.71/x
  3. Step 3: Cross multiply
    89.81x = 134.78 × 35.71
  4. Step 4: Simplify right side
    89.81x = 4,812.98
  5. Step 5: Solve for x
    x = 4,812.98/89.81
  6. Step 6: Final answer
    x = 53.59

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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.