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Finding the Fourth Proportional to 1,921.56, 2,881.08 and 765.96

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Solution

The fourth proportional to 1,921.56, 2,881.08 and 765.96 is: 1,148.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.56 : 2,881.08 = 765.96 : x
  2. Step 2: Convert to fraction form
    1,921.56/2,881.08 = 765.96/x
  3. Step 3: Cross multiply
    1,921.56x = 2,881.08 × 765.96
  4. Step 4: Simplify right side
    1,921.56x = 2,206,792.04
  5. Step 5: Solve for x
    x = 2,206,792.04/1,921.56
  6. Step 6: Final answer
    x = 1,148.44

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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.