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Finding the Fourth Proportional to 13,615.68, 18,789.24 and 8,309.52

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Solution

The fourth proportional to 13,615.68, 18,789.24 and 8,309.52 is: 11,466.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,615.68 : 18,789.24 = 8,309.52 : x
  2. Step 2: Convert to fraction form
    13,615.68/18,789.24 = 8,309.52/x
  3. Step 3: Cross multiply
    13,615.68x = 18,789.24 × 8,309.52
  4. Step 4: Simplify right side
    13,615.68x = 156,129,565.56
  5. Step 5: Solve for x
    x = 156,129,565.56/13,615.68
  6. Step 6: Final answer
    x = 11,466.89

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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.