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Finding the Fourth Proportional to 13,211, 18,231.18 and 7,906.58

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Solution

The fourth proportional to 13,211, 18,231.18 and 7,906.58 is: 10,911.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,211 : 18,231.18 = 7,906.58 : x
  2. Step 2: Convert to fraction form
    13,211/18,231.18 = 7,906.58/x
  3. Step 3: Cross multiply
    13,211x = 18,231.18 × 7,906.58
  4. Step 4: Simplify right side
    13,211x = 144,146,283.16
  5. Step 5: Solve for x
    x = 144,146,283.16/13,211
  6. Step 6: Final answer
    x = 10,911.08

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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.