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Finding the Fourth Proportional to 6,390.65, 8,818.85 and 3,558.14

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Solution

The fourth proportional to 6,390.65, 8,818.85 and 3,558.14 is: 4,910.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,390.65 : 8,818.85 = 3,558.14 : x
  2. Step 2: Convert to fraction form
    6,390.65/8,818.85 = 3,558.14/x
  3. Step 3: Cross multiply
    6,390.65x = 8,818.85 × 3,558.14
  4. Step 4: Simplify right side
    6,390.65x = 31,378,667.74
  5. Step 5: Solve for x
    x = 31,378,667.74/6,390.65
  6. Step 6: Final answer
    x = 4,910.09

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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.