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Finding the Fourth Proportional to 405.28, 607.85 and 131.33

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Solution

The fourth proportional to 405.28, 607.85 and 131.33 is: 196.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.28 : 607.85 = 131.33 : x
  2. Step 2: Convert to fraction form
    405.28/607.85 = 131.33/x
  3. Step 3: Cross multiply
    405.28x = 607.85 × 131.33
  4. Step 4: Simplify right side
    405.28x = 79,826.76
  5. Step 5: Solve for x
    x = 79,826.76/405.28
  6. Step 6: Final answer
    x = 196.97

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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.