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Finding the Fourth Proportional to 1,007.80, 1,391.94 and 677.80

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Solution

The fourth proportional to 1,007.80, 1,391.94 and 677.80 is: 936.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.80 : 1,391.94 = 677.80 : x
  2. Step 2: Convert to fraction form
    1,007.80/1,391.94 = 677.80/x
  3. Step 3: Cross multiply
    1,007.80x = 1,391.94 × 677.80
  4. Step 4: Simplify right side
    1,007.80x = 943,456.93
  5. Step 5: Solve for x
    x = 943,456.93/1,007.80
  6. Step 6: Final answer
    x = 936.15

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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.