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Finding the Fourth Proportional to 456.23, 684.75 and 212.89

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Solution

The fourth proportional to 456.23, 684.75 and 212.89 is: 319.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.23 : 684.75 = 212.89 : x
  2. Step 2: Convert to fraction form
    456.23/684.75 = 212.89/x
  3. Step 3: Cross multiply
    456.23x = 684.75 × 212.89
  4. Step 4: Simplify right side
    456.23x = 145,777.28
  5. Step 5: Solve for x
    x = 145,777.28/456.23
  6. Step 6: Final answer
    x = 319.53

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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.