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Finding the Fourth Proportional to 13,215.71, 18,236.41 and 7,910.42

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Solution

The fourth proportional to 13,215.71, 18,236.41 and 7,910.42 is: 10,915.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,215.71 : 18,236.41 = 7,910.42 : x
  2. Step 2: Convert to fraction form
    13,215.71/18,236.41 = 7,910.42/x
  3. Step 3: Cross multiply
    13,215.71x = 18,236.41 × 7,910.42
  4. Step 4: Simplify right side
    13,215.71x = 144,257,551.43
  5. Step 5: Solve for x
    x = 144,257,551.43/13,215.71
  6. Step 6: Final answer
    x = 10,915.61

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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.