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Finding the Fourth Proportional to 79.79, 119.51 and 65.39

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Solution

The fourth proportional to 79.79, 119.51 and 65.39 is: 97.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.79 : 119.51 = 65.39 : x
  2. Step 2: Convert to fraction form
    79.79/119.51 = 65.39/x
  3. Step 3: Cross multiply
    79.79x = 119.51 × 65.39
  4. Step 4: Simplify right side
    79.79x = 7,814.43
  5. Step 5: Solve for x
    x = 7,814.43/79.79
  6. Step 6: Final answer
    x = 97.94

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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.