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Finding the Fourth Proportional to 13,959.88, 20,905.02 and 9,780.28

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Solution

The fourth proportional to 13,959.88, 20,905.02 and 9,780.28 is: 14,646.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,959.88 : 20,905.02 = 9,780.28 : x
  2. Step 2: Convert to fraction form
    13,959.88/20,905.02 = 9,780.28/x
  3. Step 3: Cross multiply
    13,959.88x = 20,905.02 × 9,780.28
  4. Step 4: Simplify right side
    13,959.88x = 204,456,949.01
  5. Step 5: Solve for x
    x = 204,456,949.01/13,959.88
  6. Step 6: Final answer
    x = 14,646.04

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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.