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Finding the Fourth Proportional to 669.42, 923.67 and 389.61

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Solution

The fourth proportional to 669.42, 923.67 and 389.61 is: 537.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.42 : 923.67 = 389.61 : x
  2. Step 2: Convert to fraction form
    669.42/923.67 = 389.61/x
  3. Step 3: Cross multiply
    669.42x = 923.67 × 389.61
  4. Step 4: Simplify right side
    669.42x = 359,871.07
  5. Step 5: Solve for x
    x = 359,871.07/669.42
  6. Step 6: Final answer
    x = 537.59

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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.