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Finding the Fourth Proportional to 456.49, 684.62 and 131.78

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Solution

The fourth proportional to 456.49, 684.62 and 131.78 is: 197.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.49 : 684.62 = 131.78 : x
  2. Step 2: Convert to fraction form
    456.49/684.62 = 131.78/x
  3. Step 3: Cross multiply
    456.49x = 684.62 × 131.78
  4. Step 4: Simplify right side
    456.49x = 90,220.77
  5. Step 5: Solve for x
    x = 90,220.77/456.49
  6. Step 6: Final answer
    x = 197.64

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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.