Home / 8,311.20-11,476.80-5,172.72

Finding the Fourth Proportional to 8,311.20, 11,476.80 and 5,172.72

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Solution

The fourth proportional to 8,311.20, 11,476.80 and 5,172.72 is: 7,142.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,311.20 : 11,476.80 = 5,172.72 : x
  2. Step 2: Convert to fraction form
    8,311.20/11,476.80 = 5,172.72/x
  3. Step 3: Cross multiply
    8,311.20x = 11,476.80 × 5,172.72
  4. Step 4: Simplify right side
    8,311.20x = 59,366,272.90
  5. Step 5: Solve for x
    x = 59,366,272.90/8,311.20
  6. Step 6: Final answer
    x = 7,142.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.