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Finding the Fourth Proportional to 969.46, 1,338.10 and 620.75

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Solution

The fourth proportional to 969.46, 1,338.10 and 620.75 is: 856.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.46 : 1,338.10 = 620.75 : x
  2. Step 2: Convert to fraction form
    969.46/1,338.10 = 620.75/x
  3. Step 3: Cross multiply
    969.46x = 1,338.10 × 620.75
  4. Step 4: Simplify right side
    969.46x = 830,627.37
  5. Step 5: Solve for x
    x = 830,627.37/969.46
  6. Step 6: Final answer
    x = 856.80

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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.