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Finding the Fourth Proportional to 6,615.78, 9,129.90 and 3,963.18

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Solution

The fourth proportional to 6,615.78, 9,129.90 and 3,963.18 is: 5,469.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,615.78 : 9,129.90 = 3,963.18 : x
  2. Step 2: Convert to fraction form
    6,615.78/9,129.90 = 3,963.18/x
  3. Step 3: Cross multiply
    6,615.78x = 9,129.90 × 3,963.18
  4. Step 4: Simplify right side
    6,615.78x = 36,183,437.08
  5. Step 5: Solve for x
    x = 36,183,437.08/6,615.78
  6. Step 6: Final answer
    x = 5,469.26

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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.