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Finding the Fourth Proportional to 112.08, 154.64 and 87.44

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Solution

The fourth proportional to 112.08, 154.64 and 87.44 is: 120.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.08 : 154.64 = 87.44 : x
  2. Step 2: Convert to fraction form
    112.08/154.64 = 87.44/x
  3. Step 3: Cross multiply
    112.08x = 154.64 × 87.44
  4. Step 4: Simplify right side
    112.08x = 13,521.72
  5. Step 5: Solve for x
    x = 13,521.72/112.08
  6. Step 6: Final answer
    x = 120.64

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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.