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Finding the Fourth Proportional to 12,405.52, 17,119 and 6,816.72

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Solution

The fourth proportional to 12,405.52, 17,119 and 6,816.72 is: 9,406.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,405.52 : 17,119 = 6,816.72 : x
  2. Step 2: Convert to fraction form
    12,405.52/17,119 = 6,816.72/x
  3. Step 3: Cross multiply
    12,405.52x = 17,119 × 6,816.72
  4. Step 4: Simplify right side
    12,405.52x = 116,695,429.68
  5. Step 5: Solve for x
    x = 116,695,429.68/12,405.52
  6. Step 6: Final answer
    x = 9,406.73

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Half scale
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Double scale
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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.