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Finding the Fourth Proportional to 71.12, 106.62 and 36.86

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Solution

The fourth proportional to 71.12, 106.62 and 36.86 is: 55.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.12 : 106.62 = 36.86 : x
  2. Step 2: Convert to fraction form
    71.12/106.62 = 36.86/x
  3. Step 3: Cross multiply
    71.12x = 106.62 × 36.86
  4. Step 4: Simplify right side
    71.12x = 3,929.83
  5. Step 5: Solve for x
    x = 3,929.83/71.12
  6. Step 6: Final answer
    x = 55.26

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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.