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Finding the Fourth Proportional to 1,986.30, 2,978.22 and 946.62

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Solution

The fourth proportional to 1,986.30, 2,978.22 and 946.62 is: 1,419.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.30 : 2,978.22 = 946.62 : x
  2. Step 2: Convert to fraction form
    1,986.30/2,978.22 = 946.62/x
  3. Step 3: Cross multiply
    1,986.30x = 2,978.22 × 946.62
  4. Step 4: Simplify right side
    1,986.30x = 2,819,242.62
  5. Step 5: Solve for x
    x = 2,819,242.62/1,986.30
  6. Step 6: Final answer
    x = 1,419.34

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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.