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Finding the Fourth Proportional to 85.72, 118.03 and 73.41

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Solution

The fourth proportional to 85.72, 118.03 and 73.41 is: 101.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.72 : 118.03 = 73.41 : x
  2. Step 2: Convert to fraction form
    85.72/118.03 = 73.41/x
  3. Step 3: Cross multiply
    85.72x = 118.03 × 73.41
  4. Step 4: Simplify right side
    85.72x = 8,664.58
  5. Step 5: Solve for x
    x = 8,664.58/85.72
  6. Step 6: Final answer
    x = 101.08

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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.