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Finding the Fourth Proportional to 456.19, 684.20 and 131.49

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Solution

The fourth proportional to 456.19, 684.20 and 131.49 is: 197.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.19 : 684.20 = 131.49 : x
  2. Step 2: Convert to fraction form
    456.19/684.20 = 131.49/x
  3. Step 3: Cross multiply
    456.19x = 684.20 × 131.49
  4. Step 4: Simplify right side
    456.19x = 89,965.79
  5. Step 5: Solve for x
    x = 89,965.79/456.19
  6. Step 6: Final answer
    x = 197.21

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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.