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Finding the Fourth Proportional to 85.59, 117.81 and 79.41

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Solution

The fourth proportional to 85.59, 117.81 and 79.41 is: 109.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.59 : 117.81 = 79.41 : x
  2. Step 2: Convert to fraction form
    85.59/117.81 = 79.41/x
  3. Step 3: Cross multiply
    85.59x = 117.81 × 79.41
  4. Step 4: Simplify right side
    85.59x = 9,355.29
  5. Step 5: Solve for x
    x = 9,355.29/85.59
  6. Step 6: Final answer
    x = 109.30

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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.