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Finding the Fourth Proportional to 993.39, 1,371.32 and 620.30

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Solution

The fourth proportional to 993.39, 1,371.32 and 620.30 is: 856.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.39 : 1,371.32 = 620.30 : x
  2. Step 2: Convert to fraction form
    993.39/1,371.32 = 620.30/x
  3. Step 3: Cross multiply
    993.39x = 1,371.32 × 620.30
  4. Step 4: Simplify right side
    993.39x = 850,619.84
  5. Step 5: Solve for x
    x = 850,619.84/993.39
  6. Step 6: Final answer
    x = 856.28

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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.