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Finding the Fourth Proportional to 39.45, 59.22 and 19.20

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Solution

The fourth proportional to 39.45, 59.22 and 19.20 is: 28.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.45 : 59.22 = 19.20 : x
  2. Step 2: Convert to fraction form
    39.45/59.22 = 19.20/x
  3. Step 3: Cross multiply
    39.45x = 59.22 × 19.20
  4. Step 4: Simplify right side
    39.45x = 1,137.02
  5. Step 5: Solve for x
    x = 1,137.02/39.45
  6. Step 6: Final answer
    x = 28.82

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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.