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Finding the Fourth Proportional to 1,330.20, 1,835.49 and 770.72

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Solution

The fourth proportional to 1,330.20, 1,835.49 and 770.72 is: 1,063.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.20 : 1,835.49 = 770.72 : x
  2. Step 2: Convert to fraction form
    1,330.20/1,835.49 = 770.72/x
  3. Step 3: Cross multiply
    1,330.20x = 1,835.49 × 770.72
  4. Step 4: Simplify right side
    1,330.20x = 1,414,636.06
  5. Step 5: Solve for x
    x = 1,414,636.06/1,330.20
  6. Step 6: Final answer
    x = 1,063.48

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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.