Home / 12,121.58-16,728.12-6,816.86

Finding the Fourth Proportional to 12,121.58, 16,728.12 and 6,816.86

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Solution

The fourth proportional to 12,121.58, 16,728.12 and 6,816.86 is: 9,407.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,121.58 : 16,728.12 = 6,816.86 : x
  2. Step 2: Convert to fraction form
    12,121.58/16,728.12 = 6,816.86/x
  3. Step 3: Cross multiply
    12,121.58x = 16,728.12 × 6,816.86
  4. Step 4: Simplify right side
    12,121.58x = 114,033,252.10
  5. Step 5: Solve for x
    x = 114,033,252.10/12,121.58
  6. Step 6: Final answer
    x = 9,407.46

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Half scale
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Double scale
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Similar ratio
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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.