Home / 7,890.24-11,800.80-6,438.72

Finding the Fourth Proportional to 7,890.24, 11,800.80 and 6,438.72

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Solution

The fourth proportional to 7,890.24, 11,800.80 and 6,438.72 is: 9,629.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,890.24 : 11,800.80 = 6,438.72 : x
  2. Step 2: Convert to fraction form
    7,890.24/11,800.80 = 6,438.72/x
  3. Step 3: Cross multiply
    7,890.24x = 11,800.80 × 6,438.72
  4. Step 4: Simplify right side
    7,890.24x = 75,982,046.98
  5. Step 5: Solve for x
    x = 75,982,046.98/7,890.24
  6. Step 6: Final answer
    x = 9,629.88

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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.