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Finding the Fourth Proportional to 1,978.59, 2,967.27 and 679.75

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Solution

The fourth proportional to 1,978.59, 2,967.27 and 679.75 is: 1,019.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.59 : 2,967.27 = 679.75 : x
  2. Step 2: Convert to fraction form
    1,978.59/2,967.27 = 679.75/x
  3. Step 3: Cross multiply
    1,978.59x = 2,967.27 × 679.75
  4. Step 4: Simplify right side
    1,978.59x = 2,017,001.78
  5. Step 5: Solve for x
    x = 2,017,001.78/1,978.59
  6. Step 6: Final answer
    x = 1,019.41

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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.