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Finding the Fourth Proportional to 405.45, 608.30 and 171.29

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Solution

The fourth proportional to 405.45, 608.30 and 171.29 is: 256.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.45 : 608.30 = 171.29 : x
  2. Step 2: Convert to fraction form
    405.45/608.30 = 171.29/x
  3. Step 3: Cross multiply
    405.45x = 608.30 × 171.29
  4. Step 4: Simplify right side
    405.45x = 104,197.66
  5. Step 5: Solve for x
    x = 104,197.66/405.45
  6. Step 6: Final answer
    x = 256.99

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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.