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Finding the Fourth Proportional to 39.87, 59.39 and 38.99

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Solution

The fourth proportional to 39.87, 59.39 and 38.99 is: 58.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.87 : 59.39 = 38.99 : x
  2. Step 2: Convert to fraction form
    39.87/59.39 = 38.99/x
  3. Step 3: Cross multiply
    39.87x = 59.39 × 38.99
  4. Step 4: Simplify right side
    39.87x = 2,315.57
  5. Step 5: Solve for x
    x = 2,315.57/39.87
  6. Step 6: Final answer
    x = 58.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.