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Finding the Fourth Proportional to 6,390.30, 8,819.17 and 3,558.68

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Solution

The fourth proportional to 6,390.30, 8,819.17 and 3,558.68 is: 4,911.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,390.30 : 8,819.17 = 3,558.68 : x
  2. Step 2: Convert to fraction form
    6,390.30/8,819.17 = 3,558.68/x
  3. Step 3: Cross multiply
    6,390.30x = 8,819.17 × 3,558.68
  4. Step 4: Simplify right side
    6,390.30x = 31,384,550.90
  5. Step 5: Solve for x
    x = 31,384,550.90/6,390.30
  6. Step 6: Final answer
    x = 4,911.28

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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.