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Finding the Fourth Proportional to 668.90, 923.09 and 374.20

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Solution

The fourth proportional to 668.90, 923.09 and 374.20 is: 516.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.90 : 923.09 = 374.20 : x
  2. Step 2: Convert to fraction form
    668.90/923.09 = 374.20/x
  3. Step 3: Cross multiply
    668.90x = 923.09 × 374.20
  4. Step 4: Simplify right side
    668.90x = 345,415.66
  5. Step 5: Solve for x
    x = 345,415.66/668.90
  6. Step 6: Final answer
    x = 516.40

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1.5x scale

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.