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Finding the Fourth Proportional to 1,013.54, 1,399.38 and 640.94

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Solution

The fourth proportional to 1,013.54, 1,399.38 and 640.94 is: 884.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.54 : 1,399.38 = 640.94 : x
  2. Step 2: Convert to fraction form
    1,013.54/1,399.38 = 640.94/x
  3. Step 3: Cross multiply
    1,013.54x = 1,399.38 × 640.94
  4. Step 4: Simplify right side
    1,013.54x = 896,918.62
  5. Step 5: Solve for x
    x = 896,918.62/1,013.54
  6. Step 6: Final answer
    x = 884.94

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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.