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Finding the Fourth Proportional to 8,239.30, 12,358.90 and 1,999.31

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Solution

The fourth proportional to 8,239.30, 12,358.90 and 1,999.31 is: 2,998.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,239.30 : 12,358.90 = 1,999.31 : x
  2. Step 2: Convert to fraction form
    8,239.30/12,358.90 = 1,999.31/x
  3. Step 3: Cross multiply
    8,239.30x = 12,358.90 × 1,999.31
  4. Step 4: Simplify right side
    8,239.30x = 24,709,272.36
  5. Step 5: Solve for x
    x = 24,709,272.36/8,239.30
  6. Step 6: Final answer
    x = 2,998.95

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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.