Home / 7,815.28-11,723-2,621.20

Finding the Fourth Proportional to 7,815.28, 11,723 and 2,621.20

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Solution

The fourth proportional to 7,815.28, 11,723 and 2,621.20 is: 3,931.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,815.28 : 11,723 = 2,621.20 : x
  2. Step 2: Convert to fraction form
    7,815.28/11,723 = 2,621.20/x
  3. Step 3: Cross multiply
    7,815.28x = 11,723 × 2,621.20
  4. Step 4: Simplify right side
    7,815.28x = 30,728,327.60
  5. Step 5: Solve for x
    x = 30,728,327.60/7,815.28
  6. Step 6: Final answer
    x = 3,931.83

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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.