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Finding the Fourth Proportional to 3,072, 4,239.36 and 1,968

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Solution

The fourth proportional to 3,072, 4,239.36 and 1,968 is: 2,715.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,072 : 4,239.36 = 1,968 : x
  2. Step 2: Convert to fraction form
    3,072/4,239.36 = 1,968/x
  3. Step 3: Cross multiply
    3,072x = 4,239.36 × 1,968
  4. Step 4: Simplify right side
    3,072x = 8,343,060.48
  5. Step 5: Solve for x
    x = 8,343,060.48/3,072
  6. Step 6: Final answer
    x = 2,715.84

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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.