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Finding the Fourth Proportional to 669.51, 923.67 and 389.79

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Solution

The fourth proportional to 669.51, 923.67 and 389.79 is: 537.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.51 : 923.67 = 389.79 : x
  2. Step 2: Convert to fraction form
    669.51/923.67 = 389.79/x
  3. Step 3: Cross multiply
    669.51x = 923.67 × 389.79
  4. Step 4: Simplify right side
    669.51x = 360,037.33
  5. Step 5: Solve for x
    x = 360,037.33/669.51
  6. Step 6: Final answer
    x = 537.76

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1.5x scale

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.