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Finding the Fourth Proportional to 13,355.76, 18,425.88 and 8,379.12

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Solution

The fourth proportional to 13,355.76, 18,425.88 and 8,379.12 is: 11,560.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,355.76 : 18,425.88 = 8,379.12 : x
  2. Step 2: Convert to fraction form
    13,355.76/18,425.88 = 8,379.12/x
  3. Step 3: Cross multiply
    13,355.76x = 18,425.88 × 8,379.12
  4. Step 4: Simplify right side
    13,355.76x = 154,392,659.63
  5. Step 5: Solve for x
    x = 154,392,659.63/13,355.76
  6. Step 6: Final answer
    x = 11,560.01

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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.