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Finding the Fourth Proportional to 1,979.42, 2,969.28 and 663.17

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Solution

The fourth proportional to 1,979.42, 2,969.28 and 663.17 is: 994.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.42 : 2,969.28 = 663.17 : x
  2. Step 2: Convert to fraction form
    1,979.42/2,969.28 = 663.17/x
  3. Step 3: Cross multiply
    1,979.42x = 2,969.28 × 663.17
  4. Step 4: Simplify right side
    1,979.42x = 1,969,142.35
  5. Step 5: Solve for x
    x = 1,969,142.35/1,979.42
  6. Step 6: Final answer
    x = 994.81

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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.