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Finding the Fourth Proportional to 3,147.66, 4,342.92 and 1,821.12

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Solution

The fourth proportional to 3,147.66, 4,342.92 and 1,821.12 is: 2,512.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,147.66 : 4,342.92 = 1,821.12 : x
  2. Step 2: Convert to fraction form
    3,147.66/4,342.92 = 1,821.12/x
  3. Step 3: Cross multiply
    3,147.66x = 4,342.92 × 1,821.12
  4. Step 4: Simplify right side
    3,147.66x = 7,908,978.47
  5. Step 5: Solve for x
    x = 7,908,978.47/3,147.66
  6. Step 6: Final answer
    x = 2,512.65

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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.