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Finding the Fourth Proportional to 74.81, 112.77 and 69.86

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Solution

The fourth proportional to 74.81, 112.77 and 69.86 is: 105.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.81 : 112.77 = 69.86 : x
  2. Step 2: Convert to fraction form
    74.81/112.77 = 69.86/x
  3. Step 3: Cross multiply
    74.81x = 112.77 × 69.86
  4. Step 4: Simplify right side
    74.81x = 7,878.11
  5. Step 5: Solve for x
    x = 7,878.11/74.81
  6. Step 6: Final answer
    x = 105.31

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.