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Finding the Fourth Proportional to 4,761.80, 7,131.90 and 3,012.20

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Solution

The fourth proportional to 4,761.80, 7,131.90 and 3,012.20 is: 4,511.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,761.80 : 7,131.90 = 3,012.20 : x
  2. Step 2: Convert to fraction form
    4,761.80/7,131.90 = 3,012.20/x
  3. Step 3: Cross multiply
    4,761.80x = 7,131.90 × 3,012.20
  4. Step 4: Simplify right side
    4,761.80x = 21,482,709.18
  5. Step 5: Solve for x
    x = 21,482,709.18/4,761.80
  6. Step 6: Final answer
    x = 4,511.47

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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.