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Finding the Fourth Proportional to 804.69, 1,205.42 and 680.76

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Solution

The fourth proportional to 804.69, 1,205.42 and 680.76 is: 1,019.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.69 : 1,205.42 = 680.76 : x
  2. Step 2: Convert to fraction form
    804.69/1,205.42 = 680.76/x
  3. Step 3: Cross multiply
    804.69x = 1,205.42 × 680.76
  4. Step 4: Simplify right side
    804.69x = 820,598.32
  5. Step 5: Solve for x
    x = 820,598.32/804.69
  6. Step 6: Final answer
    x = 1,019.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.