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Finding the Fourth Proportional to 1,891.42, 2,837.48 and 851.45

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Solution

The fourth proportional to 1,891.42, 2,837.48 and 851.45 is: 1,277.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,891.42 : 2,837.48 = 851.45 : x
  2. Step 2: Convert to fraction form
    1,891.42/2,837.48 = 851.45/x
  3. Step 3: Cross multiply
    1,891.42x = 2,837.48 × 851.45
  4. Step 4: Simplify right side
    1,891.42x = 2,415,953.90
  5. Step 5: Solve for x
    x = 2,415,953.90/1,891.42
  6. Step 6: Final answer
    x = 1,277.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.