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Finding the Fourth Proportional to 1,920.87, 2,651.36 and 1,124.87

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Solution

The fourth proportional to 1,920.87, 2,651.36 and 1,124.87 is: 1,552.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.87 : 2,651.36 = 1,124.87 : x
  2. Step 2: Convert to fraction form
    1,920.87/2,651.36 = 1,124.87/x
  3. Step 3: Cross multiply
    1,920.87x = 2,651.36 × 1,124.87
  4. Step 4: Simplify right side
    1,920.87x = 2,982,416.44
  5. Step 5: Solve for x
    x = 2,982,416.44/1,920.87
  6. Step 6: Final answer
    x = 1,552.64

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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.