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Finding the Fourth Proportional to 3,972, 5,960.16 and 1,920

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Solution

The fourth proportional to 3,972, 5,960.16 and 1,920 is: 2,881.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,972 : 5,960.16 = 1,920 : x
  2. Step 2: Convert to fraction form
    3,972/5,960.16 = 1,920/x
  3. Step 3: Cross multiply
    3,972x = 5,960.16 × 1,920
  4. Step 4: Simplify right side
    3,972x = 11,443,507.20
  5. Step 5: Solve for x
    x = 11,443,507.20/3,972
  6. Step 6: Final answer
    x = 2,881.04

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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.