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Finding the Fourth Proportional to 37.36, 51.56 and 21.81

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Solution

The fourth proportional to 37.36, 51.56 and 21.81 is: 30.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.36 : 51.56 = 21.81 : x
  2. Step 2: Convert to fraction form
    37.36/51.56 = 21.81/x
  3. Step 3: Cross multiply
    37.36x = 51.56 × 21.81
  4. Step 4: Simplify right side
    37.36x = 1,124.41
  5. Step 5: Solve for x
    x = 1,124.41/37.36
  6. Step 6: Final answer
    x = 30.10

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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.