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Finding the Fourth Proportional to 3,657.84, 5,044.48 and 3,128.72

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Solution

The fourth proportional to 3,657.84, 5,044.48 and 3,128.72 is: 4,314.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,657.84 : 5,044.48 = 3,128.72 : x
  2. Step 2: Convert to fraction form
    3,657.84/5,044.48 = 3,128.72/x
  3. Step 3: Cross multiply
    3,657.84x = 5,044.48 × 3,128.72
  4. Step 4: Simplify right side
    3,657.84x = 15,782,765.47
  5. Step 5: Solve for x
    x = 15,782,765.47/3,657.84
  6. Step 6: Final answer
    x = 4,314.78

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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.