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Finding the Fourth Proportional to 39,993.96, 55,079.38 and 39,121.96

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Solution

The fourth proportional to 39,993.96, 55,079.38 and 39,121.96 is: 53,878.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,993.96 : 55,079.38 = 39,121.96 : x
  2. Step 2: Convert to fraction form
    39,993.96/55,079.38 = 39,121.96/x
  3. Step 3: Cross multiply
    39,993.96x = 55,079.38 × 39,121.96
  4. Step 4: Simplify right side
    39,993.96x = 2,154,813,301.18
  5. Step 5: Solve for x
    x = 2,154,813,301.18/39,993.96
  6. Step 6: Final answer
    x = 53,878.47

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1.5x scale

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.