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Finding the Fourth Proportional to 39,891.96, 55,048.42 and 21,987.11

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Solution

The fourth proportional to 39,891.96, 55,048.42 and 21,987.11 is: 30,340.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,891.96 : 55,048.42 = 21,987.11 : x
  2. Step 2: Convert to fraction form
    39,891.96/55,048.42 = 21,987.11/x
  3. Step 3: Cross multiply
    39,891.96x = 55,048.42 × 21,987.11
  4. Step 4: Simplify right side
    39,891.96x = 1,210,355,665.87
  5. Step 5: Solve for x
    x = 1,210,355,665.87/39,891.96
  6. Step 6: Final answer
    x = 30,340.84

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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.