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Finding the Fourth Proportional to 1,021.87, 1,409.36 and 667.77

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Solution

The fourth proportional to 1,021.87, 1,409.36 and 667.77 is: 920.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.87 : 1,409.36 = 667.77 : x
  2. Step 2: Convert to fraction form
    1,021.87/1,409.36 = 667.77/x
  3. Step 3: Cross multiply
    1,021.87x = 1,409.36 × 667.77
  4. Step 4: Simplify right side
    1,021.87x = 941,128.33
  5. Step 5: Solve for x
    x = 941,128.33/1,021.87
  6. Step 6: Final answer
    x = 920.99

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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.