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Finding the Fourth Proportional to 12,939.78, 17,842.74 and 8,740.74

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Solution

The fourth proportional to 12,939.78, 17,842.74 and 8,740.74 is: 12,052.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.78 : 17,842.74 = 8,740.74 : x
  2. Step 2: Convert to fraction form
    12,939.78/17,842.74 = 8,740.74/x
  3. Step 3: Cross multiply
    12,939.78x = 17,842.74 × 8,740.74
  4. Step 4: Simplify right side
    12,939.78x = 155,958,751.23
  5. Step 5: Solve for x
    x = 155,958,751.23/12,939.78
  6. Step 6: Final answer
    x = 12,052.66

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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.