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Finding the Fourth Proportional to 669.15, 923.38 and 389.45

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Solution

The fourth proportional to 669.15, 923.38 and 389.45 is: 537.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.15 : 923.38 = 389.45 : x
  2. Step 2: Convert to fraction form
    669.15/923.38 = 389.45/x
  3. Step 3: Cross multiply
    669.15x = 923.38 × 389.45
  4. Step 4: Simplify right side
    669.15x = 359,610.34
  5. Step 5: Solve for x
    x = 359,610.34/669.15
  6. Step 6: Final answer
    x = 537.41

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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.