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Finding the Fourth Proportional to 6,458.40, 9,665.20 and 3,863.20

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Solution

The fourth proportional to 6,458.40, 9,665.20 and 3,863.20 is: 5,781.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,458.40 : 9,665.20 = 3,863.20 : x
  2. Step 2: Convert to fraction form
    6,458.40/9,665.20 = 3,863.20/x
  3. Step 3: Cross multiply
    6,458.40x = 9,665.20 × 3,863.20
  4. Step 4: Simplify right side
    6,458.40x = 37,338,600.64
  5. Step 5: Solve for x
    x = 37,338,600.64/6,458.40
  6. Step 6: Final answer
    x = 5,781.40

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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.