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Finding the Fourth Proportional to 1,986.38, 2,979.48 and 946.88

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Solution

The fourth proportional to 1,986.38, 2,979.48 and 946.88 is: 1,420.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.38 : 2,979.48 = 946.88 : x
  2. Step 2: Convert to fraction form
    1,986.38/2,979.48 = 946.88/x
  3. Step 3: Cross multiply
    1,986.38x = 2,979.48 × 946.88
  4. Step 4: Simplify right side
    1,986.38x = 2,821,210.02
  5. Step 5: Solve for x
    x = 2,821,210.02/1,986.38
  6. Step 6: Final answer
    x = 1,420.28

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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.