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Finding the Fourth Proportional to 921.66, 1,379.61 and 704.94

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Solution

The fourth proportional to 921.66, 1,379.61 and 704.94 is: 1,055.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.66 : 1,379.61 = 704.94 : x
  2. Step 2: Convert to fraction form
    921.66/1,379.61 = 704.94/x
  3. Step 3: Cross multiply
    921.66x = 1,379.61 × 704.94
  4. Step 4: Simplify right side
    921.66x = 972,542.27
  5. Step 5: Solve for x
    x = 972,542.27/921.66
  6. Step 6: Final answer
    x = 1,055.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.