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Finding the Fourth Proportional to 930.08, 1,284.26 and 636.05

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Solution

The fourth proportional to 930.08, 1,284.26 and 636.05 is: 878.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.08 : 1,284.26 = 636.05 : x
  2. Step 2: Convert to fraction form
    930.08/1,284.26 = 636.05/x
  3. Step 3: Cross multiply
    930.08x = 1,284.26 × 636.05
  4. Step 4: Simplify right side
    930.08x = 816,853.60
  5. Step 5: Solve for x
    x = 816,853.60/930.08
  6. Step 6: Final answer
    x = 878.26

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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.