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Finding the Fourth Proportional to 13,039.86, 17,988.12 and 8,005.08

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Solution

The fourth proportional to 13,039.86, 17,988.12 and 8,005.08 is: 11,042.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,039.86 : 17,988.12 = 8,005.08 : x
  2. Step 2: Convert to fraction form
    13,039.86/17,988.12 = 8,005.08/x
  3. Step 3: Cross multiply
    13,039.86x = 17,988.12 × 8,005.08
  4. Step 4: Simplify right side
    13,039.86x = 143,996,339.65
  5. Step 5: Solve for x
    x = 143,996,339.65/13,039.86
  6. Step 6: Final answer
    x = 11,042.78

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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.