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Finding the Fourth Proportional to 1,039.75, 1,435.25 and 708.32

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Solution

The fourth proportional to 1,039.75, 1,435.25 and 708.32 is: 977.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.75 : 1,435.25 = 708.32 : x
  2. Step 2: Convert to fraction form
    1,039.75/1,435.25 = 708.32/x
  3. Step 3: Cross multiply
    1,039.75x = 1,435.25 × 708.32
  4. Step 4: Simplify right side
    1,039.75x = 1,016,616.28
  5. Step 5: Solve for x
    x = 1,016,616.28/1,039.75
  6. Step 6: Final answer
    x = 977.75

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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.