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Finding the Fourth Proportional to 1,945.20, 2,918.16 and 775.74

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Solution

The fourth proportional to 1,945.20, 2,918.16 and 775.74 is: 1,163.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,945.20 : 2,918.16 = 775.74 : x
  2. Step 2: Convert to fraction form
    1,945.20/2,918.16 = 775.74/x
  3. Step 3: Cross multiply
    1,945.20x = 2,918.16 × 775.74
  4. Step 4: Simplify right side
    1,945.20x = 2,263,733.44
  5. Step 5: Solve for x
    x = 2,263,733.44/1,945.20
  6. Step 6: Final answer
    x = 1,163.75

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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.