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Finding the Fourth Proportional to 20,606.65, 30,915.78 and 5,815.70

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Solution

The fourth proportional to 20,606.65, 30,915.78 and 5,815.70 is: 8,725.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,606.65 : 30,915.78 = 5,815.70 : x
  2. Step 2: Convert to fraction form
    20,606.65/30,915.78 = 5,815.70/x
  3. Step 3: Cross multiply
    20,606.65x = 30,915.78 × 5,815.70
  4. Step 4: Simplify right side
    20,606.65x = 179,796,841.29
  5. Step 5: Solve for x
    x = 179,796,841.29/20,606.65
  6. Step 6: Final answer
    x = 8,725.18

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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.