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Finding the Fourth Proportional to 1,917.12, 2,871.12 and 1,221.64

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Solution

The fourth proportional to 1,917.12, 2,871.12 and 1,221.64 is: 1,829.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.12 : 2,871.12 = 1,221.64 : x
  2. Step 2: Convert to fraction form
    1,917.12/2,871.12 = 1,221.64/x
  3. Step 3: Cross multiply
    1,917.12x = 2,871.12 × 1,221.64
  4. Step 4: Simplify right side
    1,917.12x = 3,507,475.04
  5. Step 5: Solve for x
    x = 3,507,475.04/1,917.12
  6. Step 6: Final answer
    x = 1,829.55

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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.