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Finding the Fourth Proportional to 112.36, 155.12 and 79.24

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Solution

The fourth proportional to 112.36, 155.12 and 79.24 is: 109.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.36 : 155.12 = 79.24 : x
  2. Step 2: Convert to fraction form
    112.36/155.12 = 79.24/x
  3. Step 3: Cross multiply
    112.36x = 155.12 × 79.24
  4. Step 4: Simplify right side
    112.36x = 12,291.71
  5. Step 5: Solve for x
    x = 12,291.71/112.36
  6. Step 6: Final answer
    x = 109.40

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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.