Home / 20,969.91-31,432.13-10,447.79

Finding the Fourth Proportional to 20,969.91, 31,432.13 and 10,447.79

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Solution

The fourth proportional to 20,969.91, 31,432.13 and 10,447.79 is: 15,660.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,969.91 : 31,432.13 = 10,447.79 : x
  2. Step 2: Convert to fraction form
    20,969.91/31,432.13 = 10,447.79/x
  3. Step 3: Cross multiply
    20,969.91x = 31,432.13 × 10,447.79
  4. Step 4: Simplify right side
    20,969.91x = 328,396,093.89
  5. Step 5: Solve for x
    x = 328,396,093.89/20,969.91
  6. Step 6: Final answer
    x = 15,660.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.