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Finding the Fourth Proportional to 13,405.75, 18,499.95 and 7,817.83

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Solution

The fourth proportional to 13,405.75, 18,499.95 and 7,817.83 is: 10,788.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,405.75 : 18,499.95 = 7,817.83 : x
  2. Step 2: Convert to fraction form
    13,405.75/18,499.95 = 7,817.83/x
  3. Step 3: Cross multiply
    13,405.75x = 18,499.95 × 7,817.83
  4. Step 4: Simplify right side
    13,405.75x = 144,629,464.11
  5. Step 5: Solve for x
    x = 144,629,464.11/13,405.75
  6. Step 6: Final answer
    x = 10,788.61

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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.