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Finding the Fourth Proportional to 774.21, 1,068.09 and 478.97

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Solution

The fourth proportional to 774.21, 1,068.09 and 478.97 is: 660.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.21 : 1,068.09 = 478.97 : x
  2. Step 2: Convert to fraction form
    774.21/1,068.09 = 478.97/x
  3. Step 3: Cross multiply
    774.21x = 1,068.09 × 478.97
  4. Step 4: Simplify right side
    774.21x = 511,577.73
  5. Step 5: Solve for x
    x = 511,577.73/774.21
  6. Step 6: Final answer
    x = 660.77

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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.