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Finding the Fourth Proportional to 52.11, 78.13 and 21.66

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Solution

The fourth proportional to 52.11, 78.13 and 21.66 is: 32.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.11 : 78.13 = 21.66 : x
  2. Step 2: Convert to fraction form
    52.11/78.13 = 21.66/x
  3. Step 3: Cross multiply
    52.11x = 78.13 × 21.66
  4. Step 4: Simplify right side
    52.11x = 1,692.03
  5. Step 5: Solve for x
    x = 1,692.03/52.11
  6. Step 6: Final answer
    x = 32.47

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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.