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Finding the Fourth Proportional to 668.88, 923.08 and 389.20

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Solution

The fourth proportional to 668.88, 923.08 and 389.20 is: 537.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.88 : 923.08 = 389.20 : x
  2. Step 2: Convert to fraction form
    668.88/923.08 = 389.20/x
  3. Step 3: Cross multiply
    668.88x = 923.08 × 389.20
  4. Step 4: Simplify right side
    668.88x = 359,262.74
  5. Step 5: Solve for x
    x = 359,262.74/668.88
  6. Step 6: Final answer
    x = 537.11

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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.