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Finding the Fourth Proportional to 3,420.66, 5,128.56 and 1,639.68

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Solution

The fourth proportional to 3,420.66, 5,128.56 and 1,639.68 is: 2,458.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,420.66 : 5,128.56 = 1,639.68 : x
  2. Step 2: Convert to fraction form
    3,420.66/5,128.56 = 1,639.68/x
  3. Step 3: Cross multiply
    3,420.66x = 5,128.56 × 1,639.68
  4. Step 4: Simplify right side
    3,420.66x = 8,409,197.26
  5. Step 5: Solve for x
    x = 8,409,197.26/3,420.66
  6. Step 6: Final answer
    x = 2,458.36

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1.5x scale

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.