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Finding the Fourth Proportional to 59.19, 81.65 and 39.75

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Solution

The fourth proportional to 59.19, 81.65 and 39.75 is: 54.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.19 : 81.65 = 39.75 : x
  2. Step 2: Convert to fraction form
    59.19/81.65 = 39.75/x
  3. Step 3: Cross multiply
    59.19x = 81.65 × 39.75
  4. Step 4: Simplify right side
    59.19x = 3,245.69
  5. Step 5: Solve for x
    x = 3,245.69/59.19
  6. Step 6: Final answer
    x = 54.84

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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.