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Finding the Fourth Proportional to 39,881.70, 55,039.19 and 21,976.70

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Solution

The fourth proportional to 39,881.70, 55,039.19 and 21,976.70 is: 30,329.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,881.70 : 55,039.19 = 21,976.70 : x
  2. Step 2: Convert to fraction form
    39,881.70/55,039.19 = 21,976.70/x
  3. Step 3: Cross multiply
    39,881.70x = 55,039.19 × 21,976.70
  4. Step 4: Simplify right side
    39,881.70x = 1,209,579,766.87
  5. Step 5: Solve for x
    x = 1,209,579,766.87/39,881.70
  6. Step 6: Final answer
    x = 30,329.19

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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.