Home / 20,803.20-31,153.60-15,580.80

Finding the Fourth Proportional to 20,803.20, 31,153.60 and 15,580.80

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Solution

The fourth proportional to 20,803.20, 31,153.60 and 15,580.80 is: 23,332.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,803.20 : 31,153.60 = 15,580.80 : x
  2. Step 2: Convert to fraction form
    20,803.20/31,153.60 = 15,580.80/x
  3. Step 3: Cross multiply
    20,803.20x = 31,153.60 × 15,580.80
  4. Step 4: Simplify right side
    20,803.20x = 485,398,010.88
  5. Step 5: Solve for x
    x = 485,398,010.88/20,803.20
  6. Step 6: Final answer
    x = 23,332.85

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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.