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Finding the Fourth Proportional to 999.47, 1,379.36 and 668.05

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Solution

The fourth proportional to 999.47, 1,379.36 and 668.05 is: 921.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.47 : 1,379.36 = 668.05 : x
  2. Step 2: Convert to fraction form
    999.47/1,379.36 = 668.05/x
  3. Step 3: Cross multiply
    999.47x = 1,379.36 × 668.05
  4. Step 4: Simplify right side
    999.47x = 921,479.67
  5. Step 5: Solve for x
    x = 921,479.67/999.47
  6. Step 6: Final answer
    x = 921.97

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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.