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Finding the Fourth Proportional to 112.79, 155.43 and 92.00

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Solution

The fourth proportional to 112.79, 155.43 and 92.00 is: 126.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.79 : 155.43 = 92.00 : x
  2. Step 2: Convert to fraction form
    112.79/155.43 = 92.00/x
  3. Step 3: Cross multiply
    112.79x = 155.43 × 92.00
  4. Step 4: Simplify right side
    112.79x = 14,298.78
  5. Step 5: Solve for x
    x = 14,298.78/112.79
  6. Step 6: Final answer
    x = 126.78

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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.