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Finding the Fourth Proportional to 13,215, 18,236.70 and 7,910.58

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Solution

The fourth proportional to 13,215, 18,236.70 and 7,910.58 is: 10,916.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,215 : 18,236.70 = 7,910.58 : x
  2. Step 2: Convert to fraction form
    13,215/18,236.70 = 7,910.58/x
  3. Step 3: Cross multiply
    13,215x = 18,236.70 × 7,910.58
  4. Step 4: Simplify right side
    13,215x = 144,262,874.29
  5. Step 5: Solve for x
    x = 144,262,874.29/13,215
  6. Step 6: Final answer
    x = 10,916.60

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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.