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Finding the Fourth Proportional to 669.36, 923.76 and 436.80

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Solution

The fourth proportional to 669.36, 923.76 and 436.80 is: 602.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.36 : 923.76 = 436.80 : x
  2. Step 2: Convert to fraction form
    669.36/923.76 = 436.80/x
  3. Step 3: Cross multiply
    669.36x = 923.76 × 436.80
  4. Step 4: Simplify right side
    669.36x = 403,498.37
  5. Step 5: Solve for x
    x = 403,498.37/669.36
  6. Step 6: Final answer
    x = 602.81

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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.