Home / 31,405.32-43,357.28-20,809.31

Finding the Fourth Proportional to 31,405.32, 43,357.28 and 20,809.31

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Solution

The fourth proportional to 31,405.32, 43,357.28 and 20,809.31 is: 28,728.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,405.32 : 43,357.28 = 20,809.31 : x
  2. Step 2: Convert to fraction form
    31,405.32/43,357.28 = 20,809.31/x
  3. Step 3: Cross multiply
    31,405.32x = 43,357.28 × 20,809.31
  4. Step 4: Simplify right side
    31,405.32x = 902,234,759.44
  5. Step 5: Solve for x
    x = 902,234,759.44/31,405.32
  6. Step 6: Final answer
    x = 28,728.72

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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.