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Finding the Fourth Proportional to 774, 1,068.12 and 463.68

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Solution

The fourth proportional to 774, 1,068.12 and 463.68 is: 639.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    774 : 1,068.12 = 463.68 : x
  2. Step 2: Convert to fraction form
    774/1,068.12 = 463.68/x
  3. Step 3: Cross multiply
    774x = 1,068.12 × 463.68
  4. Step 4: Simplify right side
    774x = 495,265.88
  5. Step 5: Solve for x
    x = 495,265.88/774
  6. Step 6: Final answer
    x = 639.88

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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.