Home / 31,025.76-42,817.32-20,974.20

Finding the Fourth Proportional to 31,025.76, 42,817.32 and 20,974.20

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Solution

The fourth proportional to 31,025.76, 42,817.32 and 20,974.20 is: 28,945.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,025.76 : 42,817.32 = 20,974.20 : x
  2. Step 2: Convert to fraction form
    31,025.76/42,817.32 = 20,974.20/x
  3. Step 3: Cross multiply
    31,025.76x = 42,817.32 × 20,974.20
  4. Step 4: Simplify right side
    31,025.76x = 898,059,033.14
  5. Step 5: Solve for x
    x = 898,059,033.14/31,025.76
  6. Step 6: Final answer
    x = 28,945.59

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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.