Home / 20,420,868.91-28,179,979.13-11,128,240.92

Finding the Fourth Proportional to 20,420,868.91, 28,179,979.13 and 11,128,240.92

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Solution

The fourth proportional to 20,420,868.91, 28,179,979.13 and 11,128,240.92 is: 15,356,525.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,420,868.91 : 28,179,979.13 = 11,128,240.92 : x
  2. Step 2: Convert to fraction form
    20,420,868.91/28,179,979.13 = 11,128,240.92/x
  3. Step 3: Cross multiply
    20,420,868.91x = 28,179,979.13 × 11,128,240.92
  4. Step 4: Simplify right side
    20,420,868.91x = 313,593,596,997,412.56
  5. Step 5: Solve for x
    x = 313,593,596,997,412.56/20,420,868.91
  6. Step 6: Final answer
    x = 15,356,525.64

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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.