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Finding the Fourth Proportional to 4,915.76, 6,783.66 and 2,819.72

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Solution

The fourth proportional to 4,915.76, 6,783.66 and 2,819.72 is: 3,891.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,915.76 : 6,783.66 = 2,819.72 : x
  2. Step 2: Convert to fraction form
    4,915.76/6,783.66 = 2,819.72/x
  3. Step 3: Cross multiply
    4,915.76x = 6,783.66 × 2,819.72
  4. Step 4: Simplify right side
    4,915.76x = 19,128,021.78
  5. Step 5: Solve for x
    x = 19,128,021.78/4,915.76
  6. Step 6: Final answer
    x = 3,891.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.