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Finding the Fourth Proportional to 3,147.58, 4,343.11 and 1,821.21

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Solution

The fourth proportional to 3,147.58, 4,343.11 and 1,821.21 is: 2,512.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,147.58 : 4,343.11 = 1,821.21 : x
  2. Step 2: Convert to fraction form
    3,147.58/4,343.11 = 1,821.21/x
  3. Step 3: Cross multiply
    3,147.58x = 4,343.11 × 1,821.21
  4. Step 4: Simplify right side
    3,147.58x = 7,909,715.36
  5. Step 5: Solve for x
    x = 7,909,715.36/3,147.58
  6. Step 6: Final answer
    x = 2,512.95

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1.5x scale

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.