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Finding the Fourth Proportional to 112.86, 155.66 and 102.06

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Solution

The fourth proportional to 112.86, 155.66 and 102.06 is: 140.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.86 : 155.66 = 102.06 : x
  2. Step 2: Convert to fraction form
    112.86/155.66 = 102.06/x
  3. Step 3: Cross multiply
    112.86x = 155.66 × 102.06
  4. Step 4: Simplify right side
    112.86x = 15,886.15
  5. Step 5: Solve for x
    x = 15,886.15/112.86
  6. Step 6: Final answer
    x = 140.76

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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.