Home / 21,939.20-32,913.60-7,145.60

Finding the Fourth Proportional to 21,939.20, 32,913.60 and 7,145.60

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Solution

The fourth proportional to 21,939.20, 32,913.60 and 7,145.60 is: 10,719.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.20 : 32,913.60 = 7,145.60 : x
  2. Step 2: Convert to fraction form
    21,939.20/32,913.60 = 7,145.60/x
  3. Step 3: Cross multiply
    21,939.20x = 32,913.60 × 7,145.60
  4. Step 4: Simplify right side
    21,939.20x = 235,187,420.16
  5. Step 5: Solve for x
    x = 235,187,420.16/21,939.20
  6. Step 6: Final answer
    x = 10,719.96

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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.