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Finding the Fourth Proportional to 405.23, 607.64 and 131.24

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Solution

The fourth proportional to 405.23, 607.64 and 131.24 is: 196.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.23 : 607.64 = 131.24 : x
  2. Step 2: Convert to fraction form
    405.23/607.64 = 131.24/x
  3. Step 3: Cross multiply
    405.23x = 607.64 × 131.24
  4. Step 4: Simplify right side
    405.23x = 79,742.98
  5. Step 5: Solve for x
    x = 79,742.98/405.23
  6. Step 6: Final answer
    x = 196.79

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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.