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Finding the Fourth Proportional to 776.67, 1,072.35 and 638.43

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Solution

The fourth proportional to 776.67, 1,072.35 and 638.43 is: 881.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.67 : 1,072.35 = 638.43 : x
  2. Step 2: Convert to fraction form
    776.67/1,072.35 = 638.43/x
  3. Step 3: Cross multiply
    776.67x = 1,072.35 × 638.43
  4. Step 4: Simplify right side
    776.67x = 684,620.41
  5. Step 5: Solve for x
    x = 684,620.41/776.67
  6. Step 6: Final answer
    x = 881.48

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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.