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Finding the Fourth Proportional to 39.65, 59.40 and 22.55

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Solution

The fourth proportional to 39.65, 59.40 and 22.55 is: 33.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.65 : 59.40 = 22.55 : x
  2. Step 2: Convert to fraction form
    39.65/59.40 = 22.55/x
  3. Step 3: Cross multiply
    39.65x = 59.40 × 22.55
  4. Step 4: Simplify right side
    39.65x = 1,339.17
  5. Step 5: Solve for x
    x = 1,339.17/39.65
  6. Step 6: Final answer
    x = 33.78

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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.