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Finding the Fourth Proportional to 1,268.62, 1,750.79 and 709.15

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Solution

The fourth proportional to 1,268.62, 1,750.79 and 709.15 is: 978.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.62 : 1,750.79 = 709.15 : x
  2. Step 2: Convert to fraction form
    1,268.62/1,750.79 = 709.15/x
  3. Step 3: Cross multiply
    1,268.62x = 1,750.79 × 709.15
  4. Step 4: Simplify right side
    1,268.62x = 1,241,572.73
  5. Step 5: Solve for x
    x = 1,241,572.73/1,268.62
  6. Step 6: Final answer
    x = 978.68

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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.