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Finding the Fourth Proportional to 6,638.79, 9,161.40 and 3,654.55

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Solution

The fourth proportional to 6,638.79, 9,161.40 and 3,654.55 is: 5,043.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,638.79 : 9,161.40 = 3,654.55 : x
  2. Step 2: Convert to fraction form
    6,638.79/9,161.40 = 3,654.55/x
  3. Step 3: Cross multiply
    6,638.79x = 9,161.40 × 3,654.55
  4. Step 4: Simplify right side
    6,638.79x = 33,480,794.37
  5. Step 5: Solve for x
    x = 33,480,794.37/6,638.79
  6. Step 6: Final answer
    x = 5,043.21

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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.