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Finding the Fourth Proportional to 79.32, 118.81 and 65.57

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Solution

The fourth proportional to 79.32, 118.81 and 65.57 is: 98.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.32 : 118.81 = 65.57 : x
  2. Step 2: Convert to fraction form
    79.32/118.81 = 65.57/x
  3. Step 3: Cross multiply
    79.32x = 118.81 × 65.57
  4. Step 4: Simplify right side
    79.32x = 7,790.01
  5. Step 5: Solve for x
    x = 7,790.01/79.32
  6. Step 6: Final answer
    x = 98.21

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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.