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Finding the Fourth Proportional to 669.29, 923.67 and 407.45

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Solution

The fourth proportional to 669.29, 923.67 and 407.45 is: 562.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.29 : 923.67 = 407.45 : x
  2. Step 2: Convert to fraction form
    669.29/923.67 = 407.45/x
  3. Step 3: Cross multiply
    669.29x = 923.67 × 407.45
  4. Step 4: Simplify right side
    669.29x = 376,351.65
  5. Step 5: Solve for x
    x = 376,351.65/669.29
  6. Step 6: Final answer
    x = 562.32

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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.