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Finding the Fourth Proportional to 79.55, 109.78 and 46.80

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Solution

The fourth proportional to 79.55, 109.78 and 46.80 is: 64.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.55 : 109.78 = 46.80 : x
  2. Step 2: Convert to fraction form
    79.55/109.78 = 46.80/x
  3. Step 3: Cross multiply
    79.55x = 109.78 × 46.80
  4. Step 4: Simplify right side
    79.55x = 5,137.70
  5. Step 5: Solve for x
    x = 5,137.70/79.55
  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.