Home / 21,011.30-28,995.17-11,579.86

Finding the Fourth Proportional to 21,011.30, 28,995.17 and 11,579.86

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Solution

The fourth proportional to 21,011.30, 28,995.17 and 11,579.86 is: 15,979.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.30 : 28,995.17 = 11,579.86 : x
  2. Step 2: Convert to fraction form
    21,011.30/28,995.17 = 11,579.86/x
  3. Step 3: Cross multiply
    21,011.30x = 28,995.17 × 11,579.86
  4. Step 4: Simplify right side
    21,011.30x = 335,759,951.38
  5. Step 5: Solve for x
    x = 335,759,951.38/21,011.30
  6. Step 6: Final answer
    x = 15,979.97

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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.