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Finding the Fourth Proportional to 1,181.99, 1,631.31 and 851.51

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Solution

The fourth proportional to 1,181.99, 1,631.31 and 851.51 is: 1,175.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.99 : 1,631.31 = 851.51 : x
  2. Step 2: Convert to fraction form
    1,181.99/1,631.31 = 851.51/x
  3. Step 3: Cross multiply
    1,181.99x = 1,631.31 × 851.51
  4. Step 4: Simplify right side
    1,181.99x = 1,389,077.66
  5. Step 5: Solve for x
    x = 1,389,077.66/1,181.99
  6. Step 6: Final answer
    x = 1,175.20

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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.