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Finding the Fourth Proportional to 3,945.74, 5,917.80 and 1,864.86

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Solution

The fourth proportional to 3,945.74, 5,917.80 and 1,864.86 is: 2,796.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,945.74 : 5,917.80 = 1,864.86 : x
  2. Step 2: Convert to fraction form
    3,945.74/5,917.80 = 1,864.86/x
  3. Step 3: Cross multiply
    3,945.74x = 5,917.80 × 1,864.86
  4. Step 4: Simplify right side
    3,945.74x = 11,035,868.51
  5. Step 5: Solve for x
    x = 11,035,868.51/3,945.74
  6. Step 6: Final answer
    x = 2,796.91

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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.