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Finding the Fourth Proportional to 71.49, 107.13 and 30.84

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Solution

The fourth proportional to 71.49, 107.13 and 30.84 is: 46.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.49 : 107.13 = 30.84 : x
  2. Step 2: Convert to fraction form
    71.49/107.13 = 30.84/x
  3. Step 3: Cross multiply
    71.49x = 107.13 × 30.84
  4. Step 4: Simplify right side
    71.49x = 3,303.89
  5. Step 5: Solve for x
    x = 3,303.89/71.49
  6. Step 6: Final answer
    x = 46.21

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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.