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Finding the Fourth Proportional to 1,268.45, 1,901.89 and 712.28

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Solution

The fourth proportional to 1,268.45, 1,901.89 and 712.28 is: 1,067.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.45 : 1,901.89 = 712.28 : x
  2. Step 2: Convert to fraction form
    1,268.45/1,901.89 = 712.28/x
  3. Step 3: Cross multiply
    1,268.45x = 1,901.89 × 712.28
  4. Step 4: Simplify right side
    1,268.45x = 1,354,681.18
  5. Step 5: Solve for x
    x = 1,354,681.18/1,268.45
  6. Step 6: Final answer
    x = 1,067.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.