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Finding the Fourth Proportional to 1,945.59, 2,917.21 and 775.77

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Solution

The fourth proportional to 1,945.59, 2,917.21 and 775.77 is: 1,163.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,945.59 : 2,917.21 = 775.77 : x
  2. Step 2: Convert to fraction form
    1,945.59/2,917.21 = 775.77/x
  3. Step 3: Cross multiply
    1,945.59x = 2,917.21 × 775.77
  4. Step 4: Simplify right side
    1,945.59x = 2,263,080.12
  5. Step 5: Solve for x
    x = 2,263,080.12/1,945.59
  6. Step 6: Final answer
    x = 1,163.18

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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.