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Finding the Fourth Proportional to 1,921.10, 2,878.95 and 765.50

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Solution

The fourth proportional to 1,921.10, 2,878.95 and 765.50 is: 1,147.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.10 : 2,878.95 = 765.50 : x
  2. Step 2: Convert to fraction form
    1,921.10/2,878.95 = 765.50/x
  3. Step 3: Cross multiply
    1,921.10x = 2,878.95 × 765.50
  4. Step 4: Simplify right side
    1,921.10x = 2,203,836.23
  5. Step 5: Solve for x
    x = 2,203,836.23/1,921.10
  6. Step 6: Final answer
    x = 1,147.17

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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.