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Finding the Fourth Proportional to 776.89, 1,073.64 and 636.78

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Solution

The fourth proportional to 776.89, 1,073.64 and 636.78 is: 880.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.89 : 1,073.64 = 636.78 : x
  2. Step 2: Convert to fraction form
    776.89/1,073.64 = 636.78/x
  3. Step 3: Cross multiply
    776.89x = 1,073.64 × 636.78
  4. Step 4: Simplify right side
    776.89x = 683,672.48
  5. Step 5: Solve for x
    x = 683,672.48/776.89
  6. Step 6: Final answer
    x = 880.01

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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.