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Finding the Fourth Proportional to 1,138.19, 1,569.91 and 696.31

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Solution

The fourth proportional to 1,138.19, 1,569.91 and 696.31 is: 960.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.19 : 1,569.91 = 696.31 : x
  2. Step 2: Convert to fraction form
    1,138.19/1,569.91 = 696.31/x
  3. Step 3: Cross multiply
    1,138.19x = 1,569.91 × 696.31
  4. Step 4: Simplify right side
    1,138.19x = 1,093,137.27
  5. Step 5: Solve for x
    x = 1,093,137.27/1,138.19
  6. Step 6: Final answer
    x = 960.42

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1.5x scale

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.