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Finding the Fourth Proportional to 79.85, 110.20 and 63.45

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Solution

The fourth proportional to 79.85, 110.20 and 63.45 is: 87.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.85 : 110.20 = 63.45 : x
  2. Step 2: Convert to fraction form
    79.85/110.20 = 63.45/x
  3. Step 3: Cross multiply
    79.85x = 110.20 × 63.45
  4. Step 4: Simplify right side
    79.85x = 6,992.00
  5. Step 5: Solve for x
    x = 6,992.00/79.85
  6. Step 6: Final answer
    x = 87.57

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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.