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Finding the Fourth Proportional to 477.54, 659.31 and 309.79

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Solution

The fourth proportional to 477.54, 659.31 and 309.79 is: 427.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.54 : 659.31 = 309.79 : x
  2. Step 2: Convert to fraction form
    477.54/659.31 = 309.79/x
  3. Step 3: Cross multiply
    477.54x = 659.31 × 309.79
  4. Step 4: Simplify right side
    477.54x = 204,247.64
  5. Step 5: Solve for x
    x = 204,247.64/477.54
  6. Step 6: Final answer
    x = 427.71

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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.