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Finding the Fourth Proportional to 1,039.48, 1,434.78 and 744.28

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Solution

The fourth proportional to 1,039.48, 1,434.78 and 744.28 is: 1,027.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.48 : 1,434.78 = 744.28 : x
  2. Step 2: Convert to fraction form
    1,039.48/1,434.78 = 744.28/x
  3. Step 3: Cross multiply
    1,039.48x = 1,434.78 × 744.28
  4. Step 4: Simplify right side
    1,039.48x = 1,067,878.06
  5. Step 5: Solve for x
    x = 1,067,878.06/1,039.48
  6. Step 6: Final answer
    x = 1,027.32

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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.