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Finding the Fourth Proportional to 456.44, 628.79 and 316.31

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Solution

The fourth proportional to 456.44, 628.79 and 316.31 is: 435.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.44 : 628.79 = 316.31 : x
  2. Step 2: Convert to fraction form
    456.44/628.79 = 316.31/x
  3. Step 3: Cross multiply
    456.44x = 628.79 × 316.31
  4. Step 4: Simplify right side
    456.44x = 198,887.84
  5. Step 5: Solve for x
    x = 198,887.84/456.44
  6. Step 6: Final answer
    x = 435.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.