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Finding the Fourth Proportional to 4,990.70, 7,486.05 and 4,115.90

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Solution

The fourth proportional to 4,990.70, 7,486.05 and 4,115.90 is: 6,173.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,990.70 : 7,486.05 = 4,115.90 : x
  2. Step 2: Convert to fraction form
    4,990.70/7,486.05 = 4,115.90/x
  3. Step 3: Cross multiply
    4,990.70x = 7,486.05 × 4,115.90
  4. Step 4: Simplify right side
    4,990.70x = 30,811,833.20
  5. Step 5: Solve for x
    x = 30,811,833.20/4,990.70
  6. Step 6: Final answer
    x = 6,173.85

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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.