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Finding the Fourth Proportional to 112.44, 155.05 and 81.51

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Solution

The fourth proportional to 112.44, 155.05 and 81.51 is: 112.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.44 : 155.05 = 81.51 : x
  2. Step 2: Convert to fraction form
    112.44/155.05 = 81.51/x
  3. Step 3: Cross multiply
    112.44x = 155.05 × 81.51
  4. Step 4: Simplify right side
    112.44x = 12,638.13
  5. Step 5: Solve for x
    x = 12,638.13/112.44
  6. Step 6: Final answer
    x = 112.40

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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.