Home / 20,807.56-31,189.20-10,280.80

Finding the Fourth Proportional to 20,807.56, 31,189.20 and 10,280.80

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Solution

The fourth proportional to 20,807.56, 31,189.20 and 10,280.80 is: 15,410.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,807.56 : 31,189.20 = 10,280.80 : x
  2. Step 2: Convert to fraction form
    20,807.56/31,189.20 = 10,280.80/x
  3. Step 3: Cross multiply
    20,807.56x = 31,189.20 × 10,280.80
  4. Step 4: Simplify right side
    20,807.56x = 320,649,927.36
  5. Step 5: Solve for x
    x = 320,649,927.36/20,807.56
  6. Step 6: Final answer
    x = 15,410.26

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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.