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Finding the Fourth Proportional to 456.34, 629.20 and 316.58

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Solution

The fourth proportional to 456.34, 629.20 and 316.58 is: 436.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.34 : 629.20 = 316.58 : x
  2. Step 2: Convert to fraction form
    456.34/629.20 = 316.58/x
  3. Step 3: Cross multiply
    456.34x = 629.20 × 316.58
  4. Step 4: Simplify right side
    456.34x = 199,187.41
  5. Step 5: Solve for x
    x = 199,187.41/456.34
  6. Step 6: Final answer
    x = 436.49

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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.