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Finding the Fourth Proportional to 1,288.96, 1,778.75 and 699.49

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Solution

The fourth proportional to 1,288.96, 1,778.75 and 699.49 is: 965.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.96 : 1,778.75 = 699.49 : x
  2. Step 2: Convert to fraction form
    1,288.96/1,778.75 = 699.49/x
  3. Step 3: Cross multiply
    1,288.96x = 1,778.75 × 699.49
  4. Step 4: Simplify right side
    1,288.96x = 1,244,217.84
  5. Step 5: Solve for x
    x = 1,244,217.84/1,288.96
  6. Step 6: Final answer
    x = 965.29

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1.5x scale

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.