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Finding the Fourth Proportional to 1,268.83, 1,750.85 and 709.28

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Solution

The fourth proportional to 1,268.83, 1,750.85 and 709.28 is: 978.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.83 : 1,750.85 = 709.28 : x
  2. Step 2: Convert to fraction form
    1,268.83/1,750.85 = 709.28/x
  3. Step 3: Cross multiply
    1,268.83x = 1,750.85 × 709.28
  4. Step 4: Simplify right side
    1,268.83x = 1,241,834.13
  5. Step 5: Solve for x
    x = 1,241,834.13/1,268.83
  6. Step 6: Final answer
    x = 978.73

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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.