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Finding the Fourth Proportional to 6,438.78, 9,661.68 and 4,248.54

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Solution

The fourth proportional to 6,438.78, 9,661.68 and 4,248.54 is: 6,375.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,438.78 : 9,661.68 = 4,248.54 : x
  2. Step 2: Convert to fraction form
    6,438.78/9,661.68 = 4,248.54/x
  3. Step 3: Cross multiply
    6,438.78x = 9,661.68 × 4,248.54
  4. Step 4: Simplify right side
    6,438.78x = 41,048,033.95
  5. Step 5: Solve for x
    x = 41,048,033.95/6,438.78
  6. Step 6: Final answer
    x = 6,375.13

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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.