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Finding the Fourth Proportional to 89.08, 133.09 and 70.68

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Solution

The fourth proportional to 89.08, 133.09 and 70.68 is: 105.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.08 : 133.09 = 70.68 : x
  2. Step 2: Convert to fraction form
    89.08/133.09 = 70.68/x
  3. Step 3: Cross multiply
    89.08x = 133.09 × 70.68
  4. Step 4: Simplify right side
    89.08x = 9,406.80
  5. Step 5: Solve for x
    x = 9,406.80/89.08
  6. Step 6: Final answer
    x = 105.60

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Why These Related Problems?

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