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Finding the Fourth Proportional to 472.60, 709.31 and 309.79

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Solution

The fourth proportional to 472.60, 709.31 and 309.79 is: 464.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.60 : 709.31 = 309.79 : x
  2. Step 2: Convert to fraction form
    472.60/709.31 = 309.79/x
  3. Step 3: Cross multiply
    472.60x = 709.31 × 309.79
  4. Step 4: Simplify right side
    472.60x = 219,737.14
  5. Step 5: Solve for x
    x = 219,737.14/472.60
  6. Step 6: Final answer
    x = 464.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.