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Finding the Fourth Proportional to 405.42, 608.07 and 131.48

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Solution

The fourth proportional to 405.42, 608.07 and 131.48 is: 197.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.42 : 608.07 = 131.48 : x
  2. Step 2: Convert to fraction form
    405.42/608.07 = 131.48/x
  3. Step 3: Cross multiply
    405.42x = 608.07 × 131.48
  4. Step 4: Simplify right side
    405.42x = 79,946.00
  5. Step 5: Solve for x
    x = 79,946.00/405.42
  6. Step 6: Final answer
    x = 197.19

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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.