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Finding the Fourth Proportional to 669.23, 923.72 and 389.42

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Solution

The fourth proportional to 669.23, 923.72 and 389.42 is: 537.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.23 : 923.72 = 389.42 : x
  2. Step 2: Convert to fraction form
    669.23/923.72 = 389.42/x
  3. Step 3: Cross multiply
    669.23x = 923.72 × 389.42
  4. Step 4: Simplify right side
    669.23x = 359,715.04
  5. Step 5: Solve for x
    x = 359,715.04/669.23
  6. Step 6: Final answer
    x = 537.51

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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.