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Finding the Fourth Proportional to 12,793.90, 17,654.84 and 7,128.30

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Solution

The fourth proportional to 12,793.90, 17,654.84 and 7,128.30 is: 9,836.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,793.90 : 17,654.84 = 7,128.30 : x
  2. Step 2: Convert to fraction form
    12,793.90/17,654.84 = 7,128.30/x
  3. Step 3: Cross multiply
    12,793.90x = 17,654.84 × 7,128.30
  4. Step 4: Simplify right side
    12,793.90x = 125,848,995.97
  5. Step 5: Solve for x
    x = 125,848,995.97/12,793.90
  6. Step 6: Final answer
    x = 9,836.64

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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.