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Finding the Fourth Proportional to 8,819.78, 12,171.21 and 4,840.85

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Solution

The fourth proportional to 8,819.78, 12,171.21 and 4,840.85 is: 6,680.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,819.78 : 12,171.21 = 4,840.85 : x
  2. Step 2: Convert to fraction form
    8,819.78/12,171.21 = 4,840.85/x
  3. Step 3: Cross multiply
    8,819.78x = 12,171.21 × 4,840.85
  4. Step 4: Simplify right side
    8,819.78x = 58,918,941.07
  5. Step 5: Solve for x
    x = 58,918,941.07/8,819.78
  6. Step 6: Final answer
    x = 6,680.32

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1.5x scale

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.