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Finding the Fourth Proportional to 31,915.25, 47,872.88 and 8,541.08

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Solution

The fourth proportional to 31,915.25, 47,872.88 and 8,541.08 is: 12,811.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,915.25 : 47,872.88 = 8,541.08 : x
  2. Step 2: Convert to fraction form
    31,915.25/47,872.88 = 8,541.08/x
  3. Step 3: Cross multiply
    31,915.25x = 47,872.88 × 8,541.08
  4. Step 4: Simplify right side
    31,915.25x = 408,886,055.21
  5. Step 5: Solve for x
    x = 408,886,055.21/31,915.25
  6. Step 6: Final answer
    x = 12,811.62

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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.