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Finding the Fourth Proportional to 669.33, 923.66 and 389.61

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Solution

The fourth proportional to 669.33, 923.66 and 389.61 is: 537.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.33 : 923.66 = 389.61 : x
  2. Step 2: Convert to fraction form
    669.33/923.66 = 389.61/x
  3. Step 3: Cross multiply
    669.33x = 923.66 × 389.61
  4. Step 4: Simplify right side
    669.33x = 359,867.17
  5. Step 5: Solve for x
    x = 359,867.17/669.33
  6. Step 6: Final answer
    x = 537.65

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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.