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Finding the Fourth Proportional to 6,419.99, 9,629.96 and 5,129.66

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Solution

The fourth proportional to 6,419.99, 9,629.96 and 5,129.66 is: 7,694.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,419.99 : 9,629.96 = 5,129.66 : x
  2. Step 2: Convert to fraction form
    6,419.99/9,629.96 = 5,129.66/x
  3. Step 3: Cross multiply
    6,419.99x = 9,629.96 × 5,129.66
  4. Step 4: Simplify right side
    6,419.99x = 49,398,346.82
  5. Step 5: Solve for x
    x = 49,398,346.82/6,419.99
  6. Step 6: Final answer
    x = 7,694.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.