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Finding the Fourth Proportional to 112.86, 155.64 and 71.38

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Solution

The fourth proportional to 112.86, 155.64 and 71.38 is: 98.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.86 : 155.64 = 71.38 : x
  2. Step 2: Convert to fraction form
    112.86/155.64 = 71.38/x
  3. Step 3: Cross multiply
    112.86x = 155.64 × 71.38
  4. Step 4: Simplify right side
    112.86x = 11,109.58
  5. Step 5: Solve for x
    x = 11,109.58/112.86
  6. Step 6: Final answer
    x = 98.44

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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.