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Finding the Fourth Proportional to 1,138.36, 1,570.60 and 696.16

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Solution

The fourth proportional to 1,138.36, 1,570.60 and 696.16 is: 960.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.36 : 1,570.60 = 696.16 : x
  2. Step 2: Convert to fraction form
    1,138.36/1,570.60 = 696.16/x
  3. Step 3: Cross multiply
    1,138.36x = 1,570.60 × 696.16
  4. Step 4: Simplify right side
    1,138.36x = 1,093,388.90
  5. Step 5: Solve for x
    x = 1,093,388.90/1,138.36
  6. Step 6: Final answer
    x = 960.49

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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.