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Finding the Fourth Proportional to 6,640.80, 9,950.40 and 4,891.20

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Solution

The fourth proportional to 6,640.80, 9,950.40 and 4,891.20 is: 7,328.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,640.80 : 9,950.40 = 4,891.20 : x
  2. Step 2: Convert to fraction form
    6,640.80/9,950.40 = 4,891.20/x
  3. Step 3: Cross multiply
    6,640.80x = 9,950.40 × 4,891.20
  4. Step 4: Simplify right side
    6,640.80x = 48,669,396.48
  5. Step 5: Solve for x
    x = 48,669,396.48/6,640.80
  6. Step 6: Final answer
    x = 7,328.85

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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.