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Finding the Fourth Proportional to 776.73, 1,070.64 and 636.60

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Solution

The fourth proportional to 776.73, 1,070.64 and 636.60 is: 877.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.73 : 1,070.64 = 636.60 : x
  2. Step 2: Convert to fraction form
    776.73/1,070.64 = 636.60/x
  3. Step 3: Cross multiply
    776.73x = 1,070.64 × 636.60
  4. Step 4: Simplify right side
    776.73x = 681,569.42
  5. Step 5: Solve for x
    x = 681,569.42/776.73
  6. Step 6: Final answer
    x = 877.49

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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.