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Finding the Fourth Proportional to 1,920.63, 2,655.20 and 1,903.09

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Solution

The fourth proportional to 1,920.63, 2,655.20 and 1,903.09 is: 2,630.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.63 : 2,655.20 = 1,903.09 : x
  2. Step 2: Convert to fraction form
    1,920.63/2,655.20 = 1,903.09/x
  3. Step 3: Cross multiply
    1,920.63x = 2,655.20 × 1,903.09
  4. Step 4: Simplify right side
    1,920.63x = 5,053,084.57
  5. Step 5: Solve for x
    x = 5,053,084.57/1,920.63
  6. Step 6: Final answer
    x = 2,630.95

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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.