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Finding the Fourth Proportional to 51.48, 77.21 and 19.39

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Solution

The fourth proportional to 51.48, 77.21 and 19.39 is: 29.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.48 : 77.21 = 19.39 : x
  2. Step 2: Convert to fraction form
    51.48/77.21 = 19.39/x
  3. Step 3: Cross multiply
    51.48x = 77.21 × 19.39
  4. Step 4: Simplify right side
    51.48x = 1,497.34
  5. Step 5: Solve for x
    x = 1,497.34/51.48
  6. Step 6: Final answer
    x = 29.09

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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.