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Finding the Fourth Proportional to 112.58, 155.35 and 68.91

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Solution

The fourth proportional to 112.58, 155.35 and 68.91 is: 95.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.58 : 155.35 = 68.91 : x
  2. Step 2: Convert to fraction form
    112.58/155.35 = 68.91/x
  3. Step 3: Cross multiply
    112.58x = 155.35 × 68.91
  4. Step 4: Simplify right side
    112.58x = 10,704.05
  5. Step 5: Solve for x
    x = 10,704.05/112.58
  6. Step 6: Final answer
    x = 95.08

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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.