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Finding the Fourth Proportional to 884.75, 1,219.69 and 621.95

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Solution

The fourth proportional to 884.75, 1,219.69 and 621.95 is: 857.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.75 : 1,219.69 = 621.95 : x
  2. Step 2: Convert to fraction form
    884.75/1,219.69 = 621.95/x
  3. Step 3: Cross multiply
    884.75x = 1,219.69 × 621.95
  4. Step 4: Simplify right side
    884.75x = 758,587.69
  5. Step 5: Solve for x
    x = 758,587.69/884.75
  6. Step 6: Final answer
    x = 857.40

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Double scale
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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.