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Finding the Fourth Proportional to 1,978.70, 2,968.52 and 680.13

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Solution

The fourth proportional to 1,978.70, 2,968.52 and 680.13 is: 1,020.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.70 : 2,968.52 = 680.13 : x
  2. Step 2: Convert to fraction form
    1,978.70/2,968.52 = 680.13/x
  3. Step 3: Cross multiply
    1,978.70x = 2,968.52 × 680.13
  4. Step 4: Simplify right side
    1,978.70x = 2,018,976.11
  5. Step 5: Solve for x
    x = 2,018,976.11/1,978.70
  6. Step 6: Final answer
    x = 1,020.36

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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.