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Finding the Fourth Proportional to 79.54, 109.78 and 46.79

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Solution

The fourth proportional to 79.54, 109.78 and 46.79 is: 64.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.54 : 109.78 = 46.79 : x
  2. Step 2: Convert to fraction form
    79.54/109.78 = 46.79/x
  3. Step 3: Cross multiply
    79.54x = 109.78 × 46.79
  4. Step 4: Simplify right side
    79.54x = 5,136.35
  5. Step 5: Solve for x
    x = 5,136.35/79.54
  6. Step 6: Final answer
    x = 64.58

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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.