Home / 20,765.20-31,147.80-20,635.60

Finding the Fourth Proportional to 20,765.20, 31,147.80 and 20,635.60

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Solution

The fourth proportional to 20,765.20, 31,147.80 and 20,635.60 is: 30,953.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,765.20 : 31,147.80 = 20,635.60 : x
  2. Step 2: Convert to fraction form
    20,765.20/31,147.80 = 20,635.60/x
  3. Step 3: Cross multiply
    20,765.20x = 31,147.80 × 20,635.60
  4. Step 4: Simplify right side
    20,765.20x = 642,753,541.68
  5. Step 5: Solve for x
    x = 642,753,541.68/20,765.20
  6. Step 6: Final answer
    x = 30,953.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.