Home / 31,205.31-43,082.40-20,313.78

Finding the Fourth Proportional to 31,205.31, 43,082.40 and 20,313.78

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Solution

The fourth proportional to 31,205.31, 43,082.40 and 20,313.78 is: 28,045.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,205.31 : 43,082.40 = 20,313.78 : x
  2. Step 2: Convert to fraction form
    31,205.31/43,082.40 = 20,313.78/x
  3. Step 3: Cross multiply
    31,205.31x = 43,082.40 × 20,313.78
  4. Step 4: Simplify right side
    31,205.31x = 875,166,395.47
  5. Step 5: Solve for x
    x = 875,166,395.47/31,205.31
  6. Step 6: Final answer
    x = 28,045.43

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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.