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Finding the Fourth Proportional to 405.39, 608.18 and 131.51

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Solution

The fourth proportional to 405.39, 608.18 and 131.51 is: 197.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.39 : 608.18 = 131.51 : x
  2. Step 2: Convert to fraction form
    405.39/608.18 = 131.51/x
  3. Step 3: Cross multiply
    405.39x = 608.18 × 131.51
  4. Step 4: Simplify right side
    405.39x = 79,978.05
  5. Step 5: Solve for x
    x = 79,978.05/405.39
  6. Step 6: Final answer
    x = 197.29

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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.