Home / 21,979.85-32,969.67-7,939.87

Finding the Fourth Proportional to 21,979.85, 32,969.67 and 7,939.87

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Solution

The fourth proportional to 21,979.85, 32,969.67 and 7,939.87 is: 11,909.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.85 : 32,969.67 = 7,939.87 : x
  2. Step 2: Convert to fraction form
    21,979.85/32,969.67 = 7,939.87/x
  3. Step 3: Cross multiply
    21,979.85x = 32,969.67 × 7,939.87
  4. Step 4: Simplify right side
    21,979.85x = 261,774,893.74
  5. Step 5: Solve for x
    x = 261,774,893.74/21,979.85
  6. Step 6: Final answer
    x = 11,909.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.