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Finding the Fourth Proportional to 89.30, 123.16 and 70.92

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Solution

The fourth proportional to 89.30, 123.16 and 70.92 is: 97.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.30 : 123.16 = 70.92 : x
  2. Step 2: Convert to fraction form
    89.30/123.16 = 70.92/x
  3. Step 3: Cross multiply
    89.30x = 123.16 × 70.92
  4. Step 4: Simplify right side
    89.30x = 8,734.15
  5. Step 5: Solve for x
    x = 8,734.15/89.30
  6. Step 6: Final answer
    x = 97.81

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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.