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Finding the Fourth Proportional to 1,968, 2,952.28 and 669.12

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Solution

The fourth proportional to 1,968, 2,952.28 and 669.12 is: 1,003.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,968 : 2,952.28 = 669.12 : x
  2. Step 2: Convert to fraction form
    1,968/2,952.28 = 669.12/x
  3. Step 3: Cross multiply
    1,968x = 2,952.28 × 669.12
  4. Step 4: Simplify right side
    1,968x = 1,975,429.59
  5. Step 5: Solve for x
    x = 1,975,429.59/1,968
  6. Step 6: Final answer
    x = 1,003.78

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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.