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Finding the Fourth Proportional to 505.12, 696.88 and 318.88

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Solution

The fourth proportional to 505.12, 696.88 and 318.88 is: 439.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.12 : 696.88 = 318.88 : x
  2. Step 2: Convert to fraction form
    505.12/696.88 = 318.88/x
  3. Step 3: Cross multiply
    505.12x = 696.88 × 318.88
  4. Step 4: Simplify right side
    505.12x = 222,221.09
  5. Step 5: Solve for x
    x = 222,221.09/505.12
  6. Step 6: Final answer
    x = 439.94

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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.