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Finding the Fourth Proportional to 79.16, 118.72 and 65.64

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Solution

The fourth proportional to 79.16, 118.72 and 65.64 is: 98.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.16 : 118.72 = 65.64 : x
  2. Step 2: Convert to fraction form
    79.16/118.72 = 65.64/x
  3. Step 3: Cross multiply
    79.16x = 118.72 × 65.64
  4. Step 4: Simplify right side
    79.16x = 7,792.78
  5. Step 5: Solve for x
    x = 7,792.78/79.16
  6. Step 6: Final answer
    x = 98.44

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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.