Home / 31,447.84-43,399.20-20,840.80

Finding the Fourth Proportional to 31,447.84, 43,399.20 and 20,840.80

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Solution

The fourth proportional to 31,447.84, 43,399.20 and 20,840.80 is: 28,761.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,447.84 : 43,399.20 = 20,840.80 : x
  2. Step 2: Convert to fraction form
    31,447.84/43,399.20 = 20,840.80/x
  3. Step 3: Cross multiply
    31,447.84x = 43,399.20 × 20,840.80
  4. Step 4: Simplify right side
    31,447.84x = 904,474,047.36
  5. Step 5: Solve for x
    x = 904,474,047.36/31,447.84
  6. Step 6: Final answer
    x = 28,761.09

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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.