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Finding the Fourth Proportional to 39.99, 59.99 and 18.62

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Solution

The fourth proportional to 39.99, 59.99 and 18.62 is: 27.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.99 : 59.99 = 18.62 : x
  2. Step 2: Convert to fraction form
    39.99/59.99 = 18.62/x
  3. Step 3: Cross multiply
    39.99x = 59.99 × 18.62
  4. Step 4: Simplify right side
    39.99x = 1,116.71
  5. Step 5: Solve for x
    x = 1,116.71/39.99
  6. Step 6: Final answer
    x = 27.92

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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.