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Finding the Fourth Proportional to 19,959.80, 29,910.90 and 8,857.40

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Solution

The fourth proportional to 19,959.80, 29,910.90 and 8,857.40 is: 13,273.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,959.80 : 29,910.90 = 8,857.40 : x
  2. Step 2: Convert to fraction form
    19,959.80/29,910.90 = 8,857.40/x
  3. Step 3: Cross multiply
    19,959.80x = 29,910.90 × 8,857.40
  4. Step 4: Simplify right side
    19,959.80x = 264,932,805.66
  5. Step 5: Solve for x
    x = 264,932,805.66/19,959.80
  6. Step 6: Final answer
    x = 13,273.32

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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.