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Finding the Fourth Proportional to 3,420.51, 5,129.55 and 1,079.82

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Solution

The fourth proportional to 3,420.51, 5,129.55 and 1,079.82 is: 1,619.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,420.51 : 5,129.55 = 1,079.82 : x
  2. Step 2: Convert to fraction form
    3,420.51/5,129.55 = 1,079.82/x
  3. Step 3: Cross multiply
    3,420.51x = 5,129.55 × 1,079.82
  4. Step 4: Simplify right side
    3,420.51x = 5,538,990.68
  5. Step 5: Solve for x
    x = 5,538,990.68/3,420.51
  6. Step 6: Final answer
    x = 1,619.35

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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.