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Finding the Fourth Proportional to 79.78, 110.18 and 64.41

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Solution

The fourth proportional to 79.78, 110.18 and 64.41 is: 88.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.78 : 110.18 = 64.41 : x
  2. Step 2: Convert to fraction form
    79.78/110.18 = 64.41/x
  3. Step 3: Cross multiply
    79.78x = 110.18 × 64.41
  4. Step 4: Simplify right side
    79.78x = 7,096.69
  5. Step 5: Solve for x
    x = 7,096.69/79.78
  6. Step 6: Final answer
    x = 88.95

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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.