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Finding the Fourth Proportional to 1,978.23, 2,967.80 and 679.70

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Solution

The fourth proportional to 1,978.23, 2,967.80 and 679.70 is: 1,019.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.23 : 2,967.80 = 679.70 : x
  2. Step 2: Convert to fraction form
    1,978.23/2,967.80 = 679.70/x
  3. Step 3: Cross multiply
    1,978.23x = 2,967.80 × 679.70
  4. Step 4: Simplify right side
    1,978.23x = 2,017,195.42
  5. Step 5: Solve for x
    x = 2,017,195.42/1,978.23
  6. Step 6: Final answer
    x = 1,019.70

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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.