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Finding the Fourth Proportional to 405.18, 606.78 and 317.79

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Solution

The fourth proportional to 405.18, 606.78 and 317.79 is: 475.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.18 : 606.78 = 317.79 : x
  2. Step 2: Convert to fraction form
    405.18/606.78 = 317.79/x
  3. Step 3: Cross multiply
    405.18x = 606.78 × 317.79
  4. Step 4: Simplify right side
    405.18x = 192,828.62
  5. Step 5: Solve for x
    x = 192,828.62/405.18
  6. Step 6: Final answer
    x = 475.91

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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.