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Finding the Fourth Proportional to 1,978.26, 2,965.35 and 744.90

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Solution

The fourth proportional to 1,978.26, 2,965.35 and 744.90 is: 1,116.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.26 : 2,965.35 = 744.90 : x
  2. Step 2: Convert to fraction form
    1,978.26/2,965.35 = 744.90/x
  3. Step 3: Cross multiply
    1,978.26x = 2,965.35 × 744.90
  4. Step 4: Simplify right side
    1,978.26x = 2,208,889.22
  5. Step 5: Solve for x
    x = 2,208,889.22/1,978.26
  6. Step 6: Final answer
    x = 1,116.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.