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Finding the Fourth Proportional to 1,181.18, 1,630.94 and 851.72

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Solution

The fourth proportional to 1,181.18, 1,630.94 and 851.72 is: 1,176.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.18 : 1,630.94 = 851.72 : x
  2. Step 2: Convert to fraction form
    1,181.18/1,630.94 = 851.72/x
  3. Step 3: Cross multiply
    1,181.18x = 1,630.94 × 851.72
  4. Step 4: Simplify right side
    1,181.18x = 1,389,091.80
  5. Step 5: Solve for x
    x = 1,389,091.80/1,181.18
  6. Step 6: Final answer
    x = 1,176.02

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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.