Home / 31,215.78-43,049.70-20,616.12

Finding the Fourth Proportional to 31,215.78, 43,049.70 and 20,616.12

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Solution

The fourth proportional to 31,215.78, 43,049.70 and 20,616.12 is: 28,431.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,215.78 : 43,049.70 = 20,616.12 : x
  2. Step 2: Convert to fraction form
    31,215.78/43,049.70 = 20,616.12/x
  3. Step 3: Cross multiply
    31,215.78x = 43,049.70 × 20,616.12
  4. Step 4: Simplify right side
    31,215.78x = 887,517,781.16
  5. Step 5: Solve for x
    x = 887,517,781.16/31,215.78
  6. Step 6: Final answer
    x = 28,431.70

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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.