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Finding the Fourth Proportional to 4,978.13, 6,872.85 and 3,212.87

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Solution

The fourth proportional to 4,978.13, 6,872.85 and 3,212.87 is: 4,435.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,978.13 : 6,872.85 = 3,212.87 : x
  2. Step 2: Convert to fraction form
    4,978.13/6,872.85 = 3,212.87/x
  3. Step 3: Cross multiply
    4,978.13x = 6,872.85 × 3,212.87
  4. Step 4: Simplify right side
    4,978.13x = 22,081,539.22
  5. Step 5: Solve for x
    x = 22,081,539.22/4,978.13
  6. Step 6: Final answer
    x = 4,435.71

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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.