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Finding the Fourth Proportional to 71.29, 106.91 and 30.69

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Solution

The fourth proportional to 71.29, 106.91 and 30.69 is: 46.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.29 : 106.91 = 30.69 : x
  2. Step 2: Convert to fraction form
    71.29/106.91 = 30.69/x
  3. Step 3: Cross multiply
    71.29x = 106.91 × 30.69
  4. Step 4: Simplify right side
    71.29x = 3,281.07
  5. Step 5: Solve for x
    x = 3,281.07/71.29
  6. Step 6: Final answer
    x = 46.02

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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.