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Finding the Fourth Proportional to 112.64, 154.60 and 100.08

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Solution

The fourth proportional to 112.64, 154.60 and 100.08 is: 137.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.64 : 154.60 = 100.08 : x
  2. Step 2: Convert to fraction form
    112.64/154.60 = 100.08/x
  3. Step 3: Cross multiply
    112.64x = 154.60 × 100.08
  4. Step 4: Simplify right side
    112.64x = 15,472.12
  5. Step 5: Solve for x
    x = 15,472.12/112.64
  6. Step 6: Final answer
    x = 137.37

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.