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Finding the Fourth Proportional to 3,108.66, 4,290 and 1,711.38

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Solution

The fourth proportional to 3,108.66, 4,290 and 1,711.38 is: 2,361.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,108.66 : 4,290 = 1,711.38 : x
  2. Step 2: Convert to fraction form
    3,108.66/4,290 = 1,711.38/x
  3. Step 3: Cross multiply
    3,108.66x = 4,290 × 1,711.38
  4. Step 4: Simplify right side
    3,108.66x = 7,341,820.20
  5. Step 5: Solve for x
    x = 7,341,820.20/3,108.66
  6. Step 6: Final answer
    x = 2,361.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.