Home / 21,939.36-30,275.76-12,987

Finding the Fourth Proportional to 21,939.36, 30,275.76 and 12,987

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Solution

The fourth proportional to 21,939.36, 30,275.76 and 12,987 is: 17,921.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.36 : 30,275.76 = 12,987 : x
  2. Step 2: Convert to fraction form
    21,939.36/30,275.76 = 12,987/x
  3. Step 3: Cross multiply
    21,939.36x = 30,275.76 × 12,987
  4. Step 4: Simplify right side
    21,939.36x = 393,191,295.12
  5. Step 5: Solve for x
    x = 393,191,295.12/21,939.36
  6. Step 6: Final answer
    x = 17,921.73

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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.