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Finding the Fourth Proportional to 1,920.96, 2,648.16 and 1,368

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Solution

The fourth proportional to 1,920.96, 2,648.16 and 1,368 is: 1,885.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.96 : 2,648.16 = 1,368 : x
  2. Step 2: Convert to fraction form
    1,920.96/2,648.16 = 1,368/x
  3. Step 3: Cross multiply
    1,920.96x = 2,648.16 × 1,368
  4. Step 4: Simplify right side
    1,920.96x = 3,622,682.88
  5. Step 5: Solve for x
    x = 3,622,682.88/1,920.96
  6. Step 6: Final answer
    x = 1,885.87

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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.