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Finding the Fourth Proportional to 12,906.81, 17,817.30 and 9,921.60

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Solution

The fourth proportional to 12,906.81, 17,817.30 and 9,921.60 is: 13,696.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,906.81 : 17,817.30 = 9,921.60 : x
  2. Step 2: Convert to fraction form
    12,906.81/17,817.30 = 9,921.60/x
  3. Step 3: Cross multiply
    12,906.81x = 17,817.30 × 9,921.60
  4. Step 4: Simplify right side
    12,906.81x = 176,776,123.68
  5. Step 5: Solve for x
    x = 176,776,123.68/12,906.81
  6. Step 6: Final answer
    x = 13,696.35

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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.