Home / 20,685.20-31,033.24-9,000.72

Finding the Fourth Proportional to 20,685.20, 31,033.24 and 9,000.72

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Solution

The fourth proportional to 20,685.20, 31,033.24 and 9,000.72 is: 13,503.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.20 : 31,033.24 = 9,000.72 : x
  2. Step 2: Convert to fraction form
    20,685.20/31,033.24 = 9,000.72/x
  3. Step 3: Cross multiply
    20,685.20x = 31,033.24 × 9,000.72
  4. Step 4: Simplify right side
    20,685.20x = 279,321,503.93
  5. Step 5: Solve for x
    x = 279,321,503.93/20,685.20
  6. Step 6: Final answer
    x = 13,503.45

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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.