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Finding the Fourth Proportional to 52.12, 78.09 and 40.66

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Solution

The fourth proportional to 52.12, 78.09 and 40.66 is: 60.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.12 : 78.09 = 40.66 : x
  2. Step 2: Convert to fraction form
    52.12/78.09 = 40.66/x
  3. Step 3: Cross multiply
    52.12x = 78.09 × 40.66
  4. Step 4: Simplify right side
    52.12x = 3,174.80
  5. Step 5: Solve for x
    x = 3,174.80/52.12
  6. Step 6: Final answer
    x = 60.91

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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.