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Finding the Fourth Proportional to 405.12, 607.70 and 131.22

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Solution

The fourth proportional to 405.12, 607.70 and 131.22 is: 196.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.12 : 607.70 = 131.22 : x
  2. Step 2: Convert to fraction form
    405.12/607.70 = 131.22/x
  3. Step 3: Cross multiply
    405.12x = 607.70 × 131.22
  4. Step 4: Simplify right side
    405.12x = 79,742.39
  5. Step 5: Solve for x
    x = 79,742.39/405.12
  6. Step 6: Final answer
    x = 196.84

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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.