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Finding the Fourth Proportional to 1,137.49, 1,569.78 and 640.12

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Solution

The fourth proportional to 1,137.49, 1,569.78 and 640.12 is: 883.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.49 : 1,569.78 = 640.12 : x
  2. Step 2: Convert to fraction form
    1,137.49/1,569.78 = 640.12/x
  3. Step 3: Cross multiply
    1,137.49x = 1,569.78 × 640.12
  4. Step 4: Simplify right side
    1,137.49x = 1,004,847.57
  5. Step 5: Solve for x
    x = 1,004,847.57/1,137.49
  6. Step 6: Final answer
    x = 883.39

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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.