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Finding the Fourth Proportional to 1,764.70, 2,435.40 and 978.80

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Solution

The fourth proportional to 1,764.70, 2,435.40 and 978.80 is: 1,350.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,764.70 : 2,435.40 = 978.80 : x
  2. Step 2: Convert to fraction form
    1,764.70/2,435.40 = 978.80/x
  3. Step 3: Cross multiply
    1,764.70x = 2,435.40 × 978.80
  4. Step 4: Simplify right side
    1,764.70x = 2,383,769.52
  5. Step 5: Solve for x
    x = 2,383,769.52/1,764.70
  6. Step 6: Final answer
    x = 1,350.81

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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.