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Finding the Fourth Proportional to 71.29, 106.86 and 30.72

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Solution

The fourth proportional to 71.29, 106.86 and 30.72 is: 46.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.29 : 106.86 = 30.72 : x
  2. Step 2: Convert to fraction form
    71.29/106.86 = 30.72/x
  3. Step 3: Cross multiply
    71.29x = 106.86 × 30.72
  4. Step 4: Simplify right side
    71.29x = 3,282.74
  5. Step 5: Solve for x
    x = 3,282.74/71.29
  6. Step 6: Final answer
    x = 46.05

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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.