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Finding the Fourth Proportional to 774.21, 1,068.41 and 459.63

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Solution

The fourth proportional to 774.21, 1,068.41 and 459.63 is: 634.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.21 : 1,068.41 = 459.63 : x
  2. Step 2: Convert to fraction form
    774.21/1,068.41 = 459.63/x
  3. Step 3: Cross multiply
    774.21x = 1,068.41 × 459.63
  4. Step 4: Simplify right side
    774.21x = 491,073.29
  5. Step 5: Solve for x
    x = 491,073.29/774.21
  6. Step 6: Final answer
    x = 634.29

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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.