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Finding the Fourth Proportional to 21,915.61, 32,876.60 and 6,917.65

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Solution

The fourth proportional to 21,915.61, 32,876.60 and 6,917.65 is: 10,377.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,915.61 : 32,876.60 = 6,917.65 : x
  2. Step 2: Convert to fraction form
    21,915.61/32,876.60 = 6,917.65/x
  3. Step 3: Cross multiply
    21,915.61x = 32,876.60 × 6,917.65
  4. Step 4: Simplify right side
    21,915.61x = 227,428,695.21
  5. Step 5: Solve for x
    x = 227,428,695.21/21,915.61
  6. Step 6: Final answer
    x = 10,377.48

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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.