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Finding the Fourth Proportional to 15,203.91, 20,984.90 and 8,918.31

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Solution

The fourth proportional to 15,203.91, 20,984.90 and 8,918.31 is: 12,309.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,203.91 : 20,984.90 = 8,918.31 : x
  2. Step 2: Convert to fraction form
    15,203.91/20,984.90 = 8,918.31/x
  3. Step 3: Cross multiply
    15,203.91x = 20,984.90 × 8,918.31
  4. Step 4: Simplify right side
    15,203.91x = 187,149,843.52
  5. Step 5: Solve for x
    x = 187,149,843.52/15,203.91
  6. Step 6: Final answer
    x = 12,309.32

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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.