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Finding the Fourth Proportional to 73.12, 109.71 and 38.86

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Solution

The fourth proportional to 73.12, 109.71 and 38.86 is: 58.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.12 : 109.71 = 38.86 : x
  2. Step 2: Convert to fraction form
    73.12/109.71 = 38.86/x
  3. Step 3: Cross multiply
    73.12x = 109.71 × 38.86
  4. Step 4: Simplify right side
    73.12x = 4,263.33
  5. Step 5: Solve for x
    x = 4,263.33/73.12
  6. Step 6: Final answer
    x = 58.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.