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Finding the Fourth Proportional to 4,286.80, 6,415.80 and 2,990.80

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Solution

The fourth proportional to 4,286.80, 6,415.80 and 2,990.80 is: 4,476.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,286.80 : 6,415.80 = 2,990.80 : x
  2. Step 2: Convert to fraction form
    4,286.80/6,415.80 = 2,990.80/x
  3. Step 3: Cross multiply
    4,286.80x = 6,415.80 × 2,990.80
  4. Step 4: Simplify right side
    4,286.80x = 19,188,374.64
  5. Step 5: Solve for x
    x = 19,188,374.64/4,286.80
  6. Step 6: Final answer
    x = 4,476.15

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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.