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Finding the Fourth Proportional to 13,105.60, 19,619.79 and 8,655.10

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Solution

The fourth proportional to 13,105.60, 19,619.79 and 8,655.10 is: 12,957.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,105.60 : 19,619.79 = 8,655.10 : x
  2. Step 2: Convert to fraction form
    13,105.60/19,619.79 = 8,655.10/x
  3. Step 3: Cross multiply
    13,105.60x = 19,619.79 × 8,655.10
  4. Step 4: Simplify right side
    13,105.60x = 169,811,244.43
  5. Step 5: Solve for x
    x = 169,811,244.43/13,105.60
  6. Step 6: Final answer
    x = 12,957.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.