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Finding the Fourth Proportional to 405.14, 607.91 and 161.80

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Solution

The fourth proportional to 405.14, 607.91 and 161.80 is: 242.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.14 : 607.91 = 161.80 : x
  2. Step 2: Convert to fraction form
    405.14/607.91 = 161.80/x
  3. Step 3: Cross multiply
    405.14x = 607.91 × 161.80
  4. Step 4: Simplify right side
    405.14x = 98,357.51
  5. Step 5: Solve for x
    x = 98,357.51/405.14
  6. Step 6: Final answer
    x = 242.78

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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.