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Finding the Fourth Proportional to 1,947.67, 2,921.67 and 613.77

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Solution

The fourth proportional to 1,947.67, 2,921.67 and 613.77 is: 920.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947.67 : 2,921.67 = 613.77 : x
  2. Step 2: Convert to fraction form
    1,947.67/2,921.67 = 613.77/x
  3. Step 3: Cross multiply
    1,947.67x = 2,921.67 × 613.77
  4. Step 4: Simplify right side
    1,947.67x = 1,793,233.40
  5. Step 5: Solve for x
    x = 1,793,233.40/1,947.67
  6. Step 6: Final answer
    x = 920.71

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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.