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Finding the Fourth Proportional to 47,718.72, 71,569.92 and 12,661.92

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Solution

The fourth proportional to 47,718.72, 71,569.92 and 12,661.92 is: 18,990.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,718.72 : 71,569.92 = 12,661.92 : x
  2. Step 2: Convert to fraction form
    47,718.72/71,569.92 = 12,661.92/x
  3. Step 3: Cross multiply
    47,718.72x = 71,569.92 × 12,661.92
  4. Step 4: Simplify right side
    47,718.72x = 906,212,601.45
  5. Step 5: Solve for x
    x = 906,212,601.45/47,718.72
  6. Step 6: Final answer
    x = 18,990.71

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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.