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Finding the Fourth Proportional to 316.76, 440.15 and 313.38

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Solution

The fourth proportional to 316.76, 440.15 and 313.38 is: 435.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.76 : 440.15 = 313.38 : x
  2. Step 2: Convert to fraction form
    316.76/440.15 = 313.38/x
  3. Step 3: Cross multiply
    316.76x = 440.15 × 313.38
  4. Step 4: Simplify right side
    316.76x = 137,932.64
  5. Step 5: Solve for x
    x = 137,932.64/316.76
  6. Step 6: Final answer
    x = 435.46

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.