Home / 31,718.11-43,751.19-20,402.35

Finding the Fourth Proportional to 31,718.11, 43,751.19 and 20,402.35

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Solution

The fourth proportional to 31,718.11, 43,751.19 and 20,402.35 is: 28,142.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,718.11 : 43,751.19 = 20,402.35 : x
  2. Step 2: Convert to fraction form
    31,718.11/43,751.19 = 20,402.35/x
  3. Step 3: Cross multiply
    31,718.11x = 43,751.19 × 20,402.35
  4. Step 4: Simplify right side
    31,718.11x = 892,627,091.30
  5. Step 5: Solve for x
    x = 892,627,091.30/31,718.11
  6. Step 6: Final answer
    x = 28,142.51

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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.