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Finding the Fourth Proportional to 79.44, 110.10 and 78

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Solution

The fourth proportional to 79.44, 110.10 and 78 is: 108.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.44 : 110.10 = 78 : x
  2. Step 2: Convert to fraction form
    79.44/110.10 = 78/x
  3. Step 3: Cross multiply
    79.44x = 110.10 × 78
  4. Step 4: Simplify right side
    79.44x = 8,587.80
  5. Step 5: Solve for x
    x = 8,587.80/79.44
  6. Step 6: Final answer
    x = 108.10

Related Problems

Find fourth proportional to 39.72, 55.05 and 39
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.