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Finding the Fourth Proportional to 1,212.39, 1,672.83 and 770.85

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Solution

The fourth proportional to 1,212.39, 1,672.83 and 770.85 is: 1,063.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.39 : 1,672.83 = 770.85 : x
  2. Step 2: Convert to fraction form
    1,212.39/1,672.83 = 770.85/x
  3. Step 3: Cross multiply
    1,212.39x = 1,672.83 × 770.85
  4. Step 4: Simplify right side
    1,212.39x = 1,289,501.01
  5. Step 5: Solve for x
    x = 1,289,501.01/1,212.39
  6. Step 6: Final answer
    x = 1,063.60

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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.