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Finding the Fourth Proportional to 1,202.70, 1,659.11 and 978.89

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Solution

The fourth proportional to 1,202.70, 1,659.11 and 978.89 is: 1,350.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,202.70 : 1,659.11 = 978.89 : x
  2. Step 2: Convert to fraction form
    1,202.70/1,659.11 = 978.89/x
  3. Step 3: Cross multiply
    1,202.70x = 1,659.11 × 978.89
  4. Step 4: Simplify right side
    1,202.70x = 1,624,085.44
  5. Step 5: Solve for x
    x = 1,624,085.44/1,202.70
  6. Step 6: Final answer
    x = 1,350.37

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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.