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Finding the Fourth Proportional to 668.98, 923.09 and 389.23

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Solution

The fourth proportional to 668.98, 923.09 and 389.23 is: 537.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.98 : 923.09 = 389.23 : x
  2. Step 2: Convert to fraction form
    668.98/923.09 = 389.23/x
  3. Step 3: Cross multiply
    668.98x = 923.09 × 389.23
  4. Step 4: Simplify right side
    668.98x = 359,294.32
  5. Step 5: Solve for x
    x = 359,294.32/668.98
  6. Step 6: Final answer
    x = 537.08

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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.