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Finding the Fourth Proportional to 1,764.75, 2,435.37 and 978.87

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Solution

The fourth proportional to 1,764.75, 2,435.37 and 978.87 is: 1,350.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,764.75 : 2,435.37 = 978.87 : x
  2. Step 2: Convert to fraction form
    1,764.75/2,435.37 = 978.87/x
  3. Step 3: Cross multiply
    1,764.75x = 2,435.37 × 978.87
  4. Step 4: Simplify right side
    1,764.75x = 2,383,910.63
  5. Step 5: Solve for x
    x = 2,383,910.63/1,764.75
  6. Step 6: Final answer
    x = 1,350.85

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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.