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Finding the Fourth Proportional to 37.77, 52.12 and 21.39

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Solution

The fourth proportional to 37.77, 52.12 and 21.39 is: 29.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.77 : 52.12 = 21.39 : x
  2. Step 2: Convert to fraction form
    37.77/52.12 = 21.39/x
  3. Step 3: Cross multiply
    37.77x = 52.12 × 21.39
  4. Step 4: Simplify right side
    37.77x = 1,114.99
  5. Step 5: Solve for x
    x = 1,114.99/37.77
  6. Step 6: Final answer
    x = 29.52

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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.