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Finding the Fourth Proportional to 2,990.80, 4,486.20 and 2,820.70

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Solution

The fourth proportional to 2,990.80, 4,486.20 and 2,820.70 is: 4,231.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.80 : 4,486.20 = 2,820.70 : x
  2. Step 2: Convert to fraction form
    2,990.80/4,486.20 = 2,820.70/x
  3. Step 3: Cross multiply
    2,990.80x = 4,486.20 × 2,820.70
  4. Step 4: Simplify right side
    2,990.80x = 12,654,224.34
  5. Step 5: Solve for x
    x = 12,654,224.34/2,990.80
  6. Step 6: Final answer
    x = 4,231.05

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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.