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Finding the Fourth Proportional to 1,268.78, 1,750.73 and 709.17

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Solution

The fourth proportional to 1,268.78, 1,750.73 and 709.17 is: 978.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.78 : 1,750.73 = 709.17 : x
  2. Step 2: Convert to fraction form
    1,268.78/1,750.73 = 709.17/x
  3. Step 3: Cross multiply
    1,268.78x = 1,750.73 × 709.17
  4. Step 4: Simplify right side
    1,268.78x = 1,241,566.97
  5. Step 5: Solve for x
    x = 1,241,566.97/1,268.78
  6. Step 6: Final answer
    x = 978.55

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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.