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Finding the Fourth Proportional to 1,330.28, 1,835.78 and 770.85

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Solution

The fourth proportional to 1,330.28, 1,835.78 and 770.85 is: 1,063.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.28 : 1,835.78 = 770.85 : x
  2. Step 2: Convert to fraction form
    1,330.28/1,835.78 = 770.85/x
  3. Step 3: Cross multiply
    1,330.28x = 1,835.78 × 770.85
  4. Step 4: Simplify right side
    1,330.28x = 1,415,116.93
  5. Step 5: Solve for x
    x = 1,415,116.93/1,330.28
  6. Step 6: Final answer
    x = 1,063.78

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.