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Finding the Fourth Proportional to 1,920.32, 2,650.92 and 1,222.64

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Solution

The fourth proportional to 1,920.32, 2,650.92 and 1,222.64 is: 1,687.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.32 : 2,650.92 = 1,222.64 : x
  2. Step 2: Convert to fraction form
    1,920.32/2,650.92 = 1,222.64/x
  3. Step 3: Cross multiply
    1,920.32x = 2,650.92 × 1,222.64
  4. Step 4: Simplify right side
    1,920.32x = 3,241,120.83
  5. Step 5: Solve for x
    x = 3,241,120.83/1,920.32
  6. Step 6: Final answer
    x = 1,687.80

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1.5x scale

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.