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Finding the Fourth Proportional to 31,815.32, 47,722.92 and 8,439.92

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Solution

The fourth proportional to 31,815.32, 47,722.92 and 8,439.92 is: 12,659.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,815.32 : 47,722.92 = 8,439.92 : x
  2. Step 2: Convert to fraction form
    31,815.32/47,722.92 = 8,439.92/x
  3. Step 3: Cross multiply
    31,815.32x = 47,722.92 × 8,439.92
  4. Step 4: Simplify right side
    31,815.32x = 402,777,626.97
  5. Step 5: Solve for x
    x = 402,777,626.97/31,815.32
  6. Step 6: Final answer
    x = 12,659.86

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1.5x scale

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.