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Finding the Fourth Proportional to 1,268.72, 1,750.79 and 709.19

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Solution

The fourth proportional to 1,268.72, 1,750.79 and 709.19 is: 978.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.72 : 1,750.79 = 709.19 : x
  2. Step 2: Convert to fraction form
    1,268.72/1,750.79 = 709.19/x
  3. Step 3: Cross multiply
    1,268.72x = 1,750.79 × 709.19
  4. Step 4: Simplify right side
    1,268.72x = 1,241,635.78
  5. Step 5: Solve for x
    x = 1,241,635.78/1,268.72
  6. Step 6: Final answer
    x = 978.66

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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.