Home / 31,745.36-43,825.92-20,990.72

Finding the Fourth Proportional to 31,745.36, 43,825.92 and 20,990.72

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Solution

The fourth proportional to 31,745.36, 43,825.92 and 20,990.72 is: 28,978.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,745.36 : 43,825.92 = 20,990.72 : x
  2. Step 2: Convert to fraction form
    31,745.36/43,825.92 = 20,990.72/x
  3. Step 3: Cross multiply
    31,745.36x = 43,825.92 × 20,990.72
  4. Step 4: Simplify right side
    31,745.36x = 919,937,615.46
  5. Step 5: Solve for x
    x = 919,937,615.46/31,745.36
  6. Step 6: Final answer
    x = 28,978.65

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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.