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Finding the Fourth Proportional to 1,945.05, 2,918.70 and 775.16

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Solution

The fourth proportional to 1,945.05, 2,918.70 and 775.16 is: 1,163.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,945.05 : 2,918.70 = 775.16 : x
  2. Step 2: Convert to fraction form
    1,945.05/2,918.70 = 775.16/x
  3. Step 3: Cross multiply
    1,945.05x = 2,918.70 × 775.16
  4. Step 4: Simplify right side
    1,945.05x = 2,262,466.79
  5. Step 5: Solve for x
    x = 2,262,466.79/1,945.05
  6. Step 6: Final answer
    x = 1,163.19

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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.