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Finding the Fourth Proportional to 1,920.76, 2,651.07 and 1,222

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Solution

The fourth proportional to 1,920.76, 2,651.07 and 1,222 is: 1,686.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.76 : 2,651.07 = 1,222 : x
  2. Step 2: Convert to fraction form
    1,920.76/2,651.07 = 1,222/x
  3. Step 3: Cross multiply
    1,920.76x = 2,651.07 × 1,222
  4. Step 4: Simplify right side
    1,920.76x = 3,239,607.54
  5. Step 5: Solve for x
    x = 3,239,607.54/1,920.76
  6. Step 6: Final answer
    x = 1,686.63

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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.