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Finding the Fourth Proportional to 669.23, 923.59 and 389.55

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Solution

The fourth proportional to 669.23, 923.59 and 389.55 is: 537.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.23 : 923.59 = 389.55 : x
  2. Step 2: Convert to fraction form
    669.23/923.59 = 389.55/x
  3. Step 3: Cross multiply
    669.23x = 923.59 × 389.55
  4. Step 4: Simplify right side
    669.23x = 359,783.51
  5. Step 5: Solve for x
    x = 359,783.51/669.23
  6. Step 6: Final answer
    x = 537.61

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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.