Home / 21,939.72-30,278.79-12,511.32

Finding the Fourth Proportional to 21,939.72, 30,278.79 and 12,511.32

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Solution

The fourth proportional to 21,939.72, 30,278.79 and 12,511.32 is: 17,266.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.72 : 30,278.79 = 12,511.32 : x
  2. Step 2: Convert to fraction form
    21,939.72/30,278.79 = 12,511.32/x
  3. Step 3: Cross multiply
    21,939.72x = 30,278.79 × 12,511.32
  4. Step 4: Simplify right side
    21,939.72x = 378,827,630.90
  5. Step 5: Solve for x
    x = 378,827,630.90/21,939.72
  6. Step 6: Final answer
    x = 17,266.75

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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.