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Finding the Fourth Proportional to 112.23, 154.85 and 63.09

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Solution

The fourth proportional to 112.23, 154.85 and 63.09 is: 87.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.23 : 154.85 = 63.09 : x
  2. Step 2: Convert to fraction form
    112.23/154.85 = 63.09/x
  3. Step 3: Cross multiply
    112.23x = 154.85 × 63.09
  4. Step 4: Simplify right side
    112.23x = 9,768.71
  5. Step 5: Solve for x
    x = 9,768.71/112.23
  6. Step 6: Final answer
    x = 87.05

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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.