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Finding the Fourth Proportional to 1,137.08, 1,569.69 and 857.42

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Solution

The fourth proportional to 1,137.08, 1,569.69 and 857.42 is: 1,183.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.08 : 1,569.69 = 857.42 : x
  2. Step 2: Convert to fraction form
    1,137.08/1,569.69 = 857.42/x
  3. Step 3: Cross multiply
    1,137.08x = 1,569.69 × 857.42
  4. Step 4: Simplify right side
    1,137.08x = 1,345,883.60
  5. Step 5: Solve for x
    x = 1,345,883.60/1,137.08
  6. Step 6: Final answer
    x = 1,183.63

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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.