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Finding the Fourth Proportional to 3,489.64, 4,815.77 and 1,917.72

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Solution

The fourth proportional to 3,489.64, 4,815.77 and 1,917.72 is: 2,646.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,489.64 : 4,815.77 = 1,917.72 : x
  2. Step 2: Convert to fraction form
    3,489.64/4,815.77 = 1,917.72/x
  3. Step 3: Cross multiply
    3,489.64x = 4,815.77 × 1,917.72
  4. Step 4: Simplify right side
    3,489.64x = 9,235,288.86
  5. Step 5: Solve for x
    x = 9,235,288.86/3,489.64
  6. Step 6: Final answer
    x = 2,646.49

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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.