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Finding the Fourth Proportional to 993.44, 1,371.21 and 620.19

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Solution

The fourth proportional to 993.44, 1,371.21 and 620.19 is: 856.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.44 : 1,371.21 = 620.19 : x
  2. Step 2: Convert to fraction form
    993.44/1,371.21 = 620.19/x
  3. Step 3: Cross multiply
    993.44x = 1,371.21 × 620.19
  4. Step 4: Simplify right side
    993.44x = 850,400.77
  5. Step 5: Solve for x
    x = 850,400.77/993.44
  6. Step 6: Final answer
    x = 856.02

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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.