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Finding the Fourth Proportional to 13,756.60, 18,988.88 and 8,451.88

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Solution

The fourth proportional to 13,756.60, 18,988.88 and 8,451.88 is: 11,666.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,756.60 : 18,988.88 = 8,451.88 : x
  2. Step 2: Convert to fraction form
    13,756.60/18,988.88 = 8,451.88/x
  3. Step 3: Cross multiply
    13,756.60x = 18,988.88 × 8,451.88
  4. Step 4: Simplify right side
    13,756.60x = 160,491,735.09
  5. Step 5: Solve for x
    x = 160,491,735.09/13,756.60
  6. Step 6: Final answer
    x = 11,666.53

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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.