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Finding the Fourth Proportional to 1,212.40, 1,672.82 and 770.86

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Solution

The fourth proportional to 1,212.40, 1,672.82 and 770.86 is: 1,063.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.40 : 1,672.82 = 770.86 : x
  2. Step 2: Convert to fraction form
    1,212.40/1,672.82 = 770.86/x
  3. Step 3: Cross multiply
    1,212.40x = 1,672.82 × 770.86
  4. Step 4: Simplify right side
    1,212.40x = 1,289,510.03
  5. Step 5: Solve for x
    x = 1,289,510.03/1,212.40
  6. Step 6: Final answer
    x = 1,063.60

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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.