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Finding the Fourth Proportional to 1,268.58, 1,750.46 and 708.90

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Solution

The fourth proportional to 1,268.58, 1,750.46 and 708.90 is: 978.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.58 : 1,750.46 = 708.90 : x
  2. Step 2: Convert to fraction form
    1,268.58/1,750.46 = 708.90/x
  3. Step 3: Cross multiply
    1,268.58x = 1,750.46 × 708.90
  4. Step 4: Simplify right side
    1,268.58x = 1,240,901.09
  5. Step 5: Solve for x
    x = 1,240,901.09/1,268.58
  6. Step 6: Final answer
    x = 978.18

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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.