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Finding the Fourth Proportional to 45,921.66, 68,871.06 and 12,640.08

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Solution

The fourth proportional to 45,921.66, 68,871.06 and 12,640.08 is: 18,956.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,921.66 : 68,871.06 = 12,640.08 : x
  2. Step 2: Convert to fraction form
    45,921.66/68,871.06 = 12,640.08/x
  3. Step 3: Cross multiply
    45,921.66x = 68,871.06 × 12,640.08
  4. Step 4: Simplify right side
    45,921.66x = 870,535,708.08
  5. Step 5: Solve for x
    x = 870,535,708.08/45,921.66
  6. Step 6: Final answer
    x = 18,956.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.