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Finding the Fourth Proportional to 405.39, 608.16 and 161.89

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Solution

The fourth proportional to 405.39, 608.16 and 161.89 is: 242.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.39 : 608.16 = 161.89 : x
  2. Step 2: Convert to fraction form
    405.39/608.16 = 161.89/x
  3. Step 3: Cross multiply
    405.39x = 608.16 × 161.89
  4. Step 4: Simplify right side
    405.39x = 98,454.11
  5. Step 5: Solve for x
    x = 98,454.11/405.39
  6. Step 6: Final answer
    x = 242.86

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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.