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Finding the Fourth Proportional to 1,268.69, 1,750.79 and 716.69

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Solution

The fourth proportional to 1,268.69, 1,750.79 and 716.69 is: 989.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.69 : 1,750.79 = 716.69 : x
  2. Step 2: Convert to fraction form
    1,268.69/1,750.79 = 716.69/x
  3. Step 3: Cross multiply
    1,268.69x = 1,750.79 × 716.69
  4. Step 4: Simplify right side
    1,268.69x = 1,254,771.10
  5. Step 5: Solve for x
    x = 1,254,771.10/1,268.69
  6. Step 6: Final answer
    x = 989.03

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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.