Home / 20,805,005.72-28,687,412.69-15,561,208.79

Finding the Fourth Proportional to 20,805,005.72, 28,687,412.69 and 15,561,208.79

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Solution

The fourth proportional to 20,805,005.72, 28,687,412.69 and 15,561,208.79 is: 21,456,894.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805,005.72 : 28,687,412.69 = 15,561,208.79 : x
  2. Step 2: Convert to fraction form
    20,805,005.72/28,687,412.69 = 15,561,208.79/x
  3. Step 3: Cross multiply
    20,805,005.72x = 28,687,412.69 × 15,561,208.79
  4. Step 4: Simplify right side
    20,805,005.72x = 446,410,818,458,674.75
  5. Step 5: Solve for x
    x = 446,410,818,458,674.75/20,805,005.72
  6. Step 6: Final answer
    x = 21,456,894.77

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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.