Home / 39,780.36-54,898.31-21,876.72

Finding the Fourth Proportional to 39,780.36, 54,898.31 and 21,876.72

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Solution

The fourth proportional to 39,780.36, 54,898.31 and 21,876.72 is: 30,190.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,780.36 : 54,898.31 = 21,876.72 : x
  2. Step 2: Convert to fraction form
    39,780.36/54,898.31 = 21,876.72/x
  3. Step 3: Cross multiply
    39,780.36x = 54,898.31 × 21,876.72
  4. Step 4: Simplify right side
    39,780.36x = 1,200,994,846.96
  5. Step 5: Solve for x
    x = 1,200,994,846.96/39,780.36
  6. Step 6: Final answer
    x = 30,190.65

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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.