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Finding the Fourth Proportional to 39,894.57, 55,054.89 and 21,990.27

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Solution

The fourth proportional to 39,894.57, 55,054.89 and 21,990.27 is: 30,346.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,894.57 : 55,054.89 = 21,990.27 : x
  2. Step 2: Convert to fraction form
    39,894.57/55,054.89 = 21,990.27/x
  3. Step 3: Cross multiply
    39,894.57x = 55,054.89 × 21,990.27
  4. Step 4: Simplify right side
    39,894.57x = 1,210,671,895.92
  5. Step 5: Solve for x
    x = 1,210,671,895.92/39,894.57
  6. Step 6: Final answer
    x = 30,346.78

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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.