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Finding the Fourth Proportional to 15,135.70, 20,886.74 and 8,329.09

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Solution

The fourth proportional to 15,135.70, 20,886.74 and 8,329.09 is: 11,493.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.70 : 20,886.74 = 8,329.09 : x
  2. Step 2: Convert to fraction form
    15,135.70/20,886.74 = 8,329.09/x
  3. Step 3: Cross multiply
    15,135.70x = 20,886.74 × 8,329.09
  4. Step 4: Simplify right side
    15,135.70x = 173,967,505.87
  5. Step 5: Solve for x
    x = 173,967,505.87/15,135.70
  6. Step 6: Final answer
    x = 11,493.85

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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.