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Finding the Fourth Proportional to 1,362.90, 1,879.17 and 921.78

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Solution

The fourth proportional to 1,362.90, 1,879.17 and 921.78 is: 1,270.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,362.90 : 1,879.17 = 921.78 : x
  2. Step 2: Convert to fraction form
    1,362.90/1,879.17 = 921.78/x
  3. Step 3: Cross multiply
    1,362.90x = 1,879.17 × 921.78
  4. Step 4: Simplify right side
    1,362.90x = 1,732,181.32
  5. Step 5: Solve for x
    x = 1,732,181.32/1,362.90
  6. Step 6: Final answer
    x = 1,270.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.