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Finding the Fourth Proportional to 89.68, 134.58 and 70.49

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Solution

The fourth proportional to 89.68, 134.58 and 70.49 is: 105.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.68 : 134.58 = 70.49 : x
  2. Step 2: Convert to fraction form
    89.68/134.58 = 70.49/x
  3. Step 3: Cross multiply
    89.68x = 134.58 × 70.49
  4. Step 4: Simplify right side
    89.68x = 9,485.87
  5. Step 5: Solve for x
    x = 9,485.87/89.68
  6. Step 6: Final answer
    x = 105.78

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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.