Home / 31,420.42-43,370.28-20,120.32

Finding the Fourth Proportional to 31,420.42, 43,370.28 and 20,120.32

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Solution

The fourth proportional to 31,420.42, 43,370.28 and 20,120.32 is: 27,772.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,420.42 : 43,370.28 = 20,120.32 : x
  2. Step 2: Convert to fraction form
    31,420.42/43,370.28 = 20,120.32/x
  3. Step 3: Cross multiply
    31,420.42x = 43,370.28 × 20,120.32
  4. Step 4: Simplify right side
    31,420.42x = 872,623,912.09
  5. Step 5: Solve for x
    x = 872,623,912.09/31,420.42
  6. Step 6: Final answer
    x = 27,772.51

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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.