Home / 10,931.20-16,399.68-3,140.64

Finding the Fourth Proportional to 10,931.20, 16,399.68 and 3,140.64

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Solution

The fourth proportional to 10,931.20, 16,399.68 and 3,140.64 is: 4,711.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,931.20 : 16,399.68 = 3,140.64 : x
  2. Step 2: Convert to fraction form
    10,931.20/16,399.68 = 3,140.64/x
  3. Step 3: Cross multiply
    10,931.20x = 16,399.68 × 3,140.64
  4. Step 4: Simplify right side
    10,931.20x = 51,505,491.00
  5. Step 5: Solve for x
    x = 51,505,491.00/10,931.20
  6. Step 6: Final answer
    x = 4,711.79

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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.