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Finding the Fourth Proportional to 13,688.60, 18,890.36 and 8,655.09

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Solution

The fourth proportional to 13,688.60, 18,890.36 and 8,655.09 is: 11,944.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.60 : 18,890.36 = 8,655.09 : x
  2. Step 2: Convert to fraction form
    13,688.60/18,890.36 = 8,655.09/x
  3. Step 3: Cross multiply
    13,688.60x = 18,890.36 × 8,655.09
  4. Step 4: Simplify right side
    13,688.60x = 163,497,765.93
  5. Step 5: Solve for x
    x = 163,497,765.93/13,688.60
  6. Step 6: Final answer
    x = 11,944.08

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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.