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Finding the Fourth Proportional to 89.13, 123.09 and 70.84

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Solution

The fourth proportional to 89.13, 123.09 and 70.84 is: 97.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.13 : 123.09 = 70.84 : x
  2. Step 2: Convert to fraction form
    89.13/123.09 = 70.84/x
  3. Step 3: Cross multiply
    89.13x = 123.09 × 70.84
  4. Step 4: Simplify right side
    89.13x = 8,719.58
  5. Step 5: Solve for x
    x = 8,719.58/89.13
  6. Step 6: Final answer
    x = 97.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.