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Finding the Fourth Proportional to 112.08, 154.76 and 79.28

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Solution

The fourth proportional to 112.08, 154.76 and 79.28 is: 109.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.08 : 154.76 = 79.28 : x
  2. Step 2: Convert to fraction form
    112.08/154.76 = 79.28/x
  3. Step 3: Cross multiply
    112.08x = 154.76 × 79.28
  4. Step 4: Simplify right side
    112.08x = 12,269.23
  5. Step 5: Solve for x
    x = 12,269.23/112.08
  6. Step 6: Final answer
    x = 109.46

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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.