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Finding the Fourth Proportional to 84.92, 128.00 and 79.35

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Solution

The fourth proportional to 84.92, 128.00 and 79.35 is: 119.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.92 : 128.00 = 79.35 : x
  2. Step 2: Convert to fraction form
    84.92/128.00 = 79.35/x
  3. Step 3: Cross multiply
    84.92x = 128.00 × 79.35
  4. Step 4: Simplify right side
    84.92x = 10,156.40
  5. Step 5: Solve for x
    x = 10,156.40/84.92
  6. Step 6: Final answer
    x = 119.61

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.