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Finding the Fourth Proportional to 12,979.11, 17,911.17 and 7,010.78

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Solution

The fourth proportional to 12,979.11, 17,911.17 and 7,010.78 is: 9,674.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,979.11 : 17,911.17 = 7,010.78 : x
  2. Step 2: Convert to fraction form
    12,979.11/17,911.17 = 7,010.78/x
  3. Step 3: Cross multiply
    12,979.11x = 17,911.17 × 7,010.78
  4. Step 4: Simplify right side
    12,979.11x = 125,571,182.86
  5. Step 5: Solve for x
    x = 125,571,182.86/12,979.11
  6. Step 6: Final answer
    x = 9,674.87

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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.