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Finding the Fourth Proportional to 52.12, 71.91 and 30.30

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Solution

The fourth proportional to 52.12, 71.91 and 30.30 is: 41.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.12 : 71.91 = 30.30 : x
  2. Step 2: Convert to fraction form
    52.12/71.91 = 30.30/x
  3. Step 3: Cross multiply
    52.12x = 71.91 × 30.30
  4. Step 4: Simplify right side
    52.12x = 2,178.87
  5. Step 5: Solve for x
    x = 2,178.87/52.12
  6. Step 6: Final answer
    x = 41.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.