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Finding the Fourth Proportional to 1,400.30, 1,932.45 and 770.85

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Solution

The fourth proportional to 1,400.30, 1,932.45 and 770.85 is: 1,063.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.30 : 1,932.45 = 770.85 : x
  2. Step 2: Convert to fraction form
    1,400.30/1,932.45 = 770.85/x
  3. Step 3: Cross multiply
    1,400.30x = 1,932.45 × 770.85
  4. Step 4: Simplify right side
    1,400.30x = 1,489,629.08
  5. Step 5: Solve for x
    x = 1,489,629.08/1,400.30
  6. Step 6: Final answer
    x = 1,063.80

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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.