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Finding the Fourth Proportional to 1,920.38, 2,881.03 and 621.85

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Solution

The fourth proportional to 1,920.38, 2,881.03 and 621.85 is: 932.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.38 : 2,881.03 = 621.85 : x
  2. Step 2: Convert to fraction form
    1,920.38/2,881.03 = 621.85/x
  3. Step 3: Cross multiply
    1,920.38x = 2,881.03 × 621.85
  4. Step 4: Simplify right side
    1,920.38x = 1,791,577.26
  5. Step 5: Solve for x
    x = 1,791,577.26/1,920.38
  6. Step 6: Final answer
    x = 932.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.