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Finding the Fourth Proportional to 13,699.71, 18,899.59 and 8,031.57

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Solution

The fourth proportional to 13,699.71, 18,899.59 and 8,031.57 is: 11,080.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,699.71 : 18,899.59 = 8,031.57 : x
  2. Step 2: Convert to fraction form
    13,699.71/18,899.59 = 8,031.57/x
  3. Step 3: Cross multiply
    13,699.71x = 18,899.59 × 8,031.57
  4. Step 4: Simplify right side
    13,699.71x = 151,793,380.06
  5. Step 5: Solve for x
    x = 151,793,380.06/13,699.71
  6. Step 6: Final answer
    x = 11,080.04

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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.