Home / 12,505.39-17,228.16-8,721.69

Finding the Fourth Proportional to 12,505.39, 17,228.16 and 8,721.69

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Solution

The fourth proportional to 12,505.39, 17,228.16 and 8,721.69 is: 12,015.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,505.39 : 17,228.16 = 8,721.69 : x
  2. Step 2: Convert to fraction form
    12,505.39/17,228.16 = 8,721.69/x
  3. Step 3: Cross multiply
    12,505.39x = 17,228.16 × 8,721.69
  4. Step 4: Simplify right side
    12,505.39x = 150,258,670.79
  5. Step 5: Solve for x
    x = 150,258,670.79/12,505.39
  6. Step 6: Final answer
    x = 12,015.51

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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.