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Finding the Fourth Proportional to 112.87, 155.69 and 80.07

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Solution

The fourth proportional to 112.87, 155.69 and 80.07 is: 110.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.87 : 155.69 = 80.07 : x
  2. Step 2: Convert to fraction form
    112.87/155.69 = 80.07/x
  3. Step 3: Cross multiply
    112.87x = 155.69 × 80.07
  4. Step 4: Simplify right side
    112.87x = 12,466.10
  5. Step 5: Solve for x
    x = 12,466.10/112.87
  6. Step 6: Final answer
    x = 110.45

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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.