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Finding the Fourth Proportional to 37.40, 51.62 and 21.87

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Solution

The fourth proportional to 37.40, 51.62 and 21.87 is: 30.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.40 : 51.62 = 21.87 : x
  2. Step 2: Convert to fraction form
    37.40/51.62 = 21.87/x
  3. Step 3: Cross multiply
    37.40x = 51.62 × 21.87
  4. Step 4: Simplify right side
    37.40x = 1,128.73
  5. Step 5: Solve for x
    x = 1,128.73/37.40
  6. Step 6: Final answer
    x = 30.18

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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.