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Finding the Fourth Proportional to 1,978.70, 2,728.64 and 1,679.61

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Solution

The fourth proportional to 1,978.70, 2,728.64 and 1,679.61 is: 2,316.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.70 : 2,728.64 = 1,679.61 : x
  2. Step 2: Convert to fraction form
    1,978.70/2,728.64 = 1,679.61/x
  3. Step 3: Cross multiply
    1,978.70x = 2,728.64 × 1,679.61
  4. Step 4: Simplify right side
    1,978.70x = 4,583,048.34
  5. Step 5: Solve for x
    x = 4,583,048.34/1,978.70
  6. Step 6: Final answer
    x = 2,316.19

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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.