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Finding the Fourth Proportional to 3,141.86, 4,712.31 and 920.09

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Solution

The fourth proportional to 3,141.86, 4,712.31 and 920.09 is: 1,380.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,141.86 : 4,712.31 = 920.09 : x
  2. Step 2: Convert to fraction form
    3,141.86/4,712.31 = 920.09/x
  3. Step 3: Cross multiply
    3,141.86x = 4,712.31 × 920.09
  4. Step 4: Simplify right side
    3,141.86x = 4,335,761.09
  5. Step 5: Solve for x
    x = 4,335,761.09/3,141.86
  6. Step 6: Final answer
    x = 1,380.00

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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.