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Finding the Fourth Proportional to 477.77, 658.85 and 309.49

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Solution

The fourth proportional to 477.77, 658.85 and 309.49 is: 426.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.77 : 658.85 = 309.49 : x
  2. Step 2: Convert to fraction form
    477.77/658.85 = 309.49/x
  3. Step 3: Cross multiply
    477.77x = 658.85 × 309.49
  4. Step 4: Simplify right side
    477.77x = 203,904.29
  5. Step 5: Solve for x
    x = 203,904.29/477.77
  6. Step 6: Final answer
    x = 426.79

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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.