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Finding the Fourth Proportional to 112.88, 155.74 and 69.20

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Solution

The fourth proportional to 112.88, 155.74 and 69.20 is: 95.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.88 : 155.74 = 69.20 : x
  2. Step 2: Convert to fraction form
    112.88/155.74 = 69.20/x
  3. Step 3: Cross multiply
    112.88x = 155.74 × 69.20
  4. Step 4: Simplify right side
    112.88x = 10,777.21
  5. Step 5: Solve for x
    x = 10,777.21/112.88
  6. Step 6: Final answer
    x = 95.47

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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.