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Finding the Fourth Proportional to 15,919.20, 21,969.99 and 9,204.43

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Solution

The fourth proportional to 15,919.20, 21,969.99 and 9,204.43 is: 12,702.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,919.20 : 21,969.99 = 9,204.43 : x
  2. Step 2: Convert to fraction form
    15,919.20/21,969.99 = 9,204.43/x
  3. Step 3: Cross multiply
    15,919.20x = 21,969.99 × 9,204.43
  4. Step 4: Simplify right side
    15,919.20x = 202,221,235.06
  5. Step 5: Solve for x
    x = 202,221,235.06/15,919.20
  6. Step 6: Final answer
    x = 12,702.98

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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.