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Finding the Fourth Proportional to 668.89, 923.07 and 389.17

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Solution

The fourth proportional to 668.89, 923.07 and 389.17 is: 537.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.89 : 923.07 = 389.17 : x
  2. Step 2: Convert to fraction form
    668.89/923.07 = 389.17/x
  3. Step 3: Cross multiply
    668.89x = 923.07 × 389.17
  4. Step 4: Simplify right side
    668.89x = 359,231.15
  5. Step 5: Solve for x
    x = 359,231.15/668.89
  6. Step 6: Final answer
    x = 537.06

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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.