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Finding the Fourth Proportional to 316.26, 436.68 and 285.05

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Solution

The fourth proportional to 316.26, 436.68 and 285.05 is: 393.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.26 : 436.68 = 285.05 : x
  2. Step 2: Convert to fraction form
    316.26/436.68 = 285.05/x
  3. Step 3: Cross multiply
    316.26x = 436.68 × 285.05
  4. Step 4: Simplify right side
    316.26x = 124,476.73
  5. Step 5: Solve for x
    x = 124,476.73/316.26
  6. Step 6: Final answer
    x = 393.59

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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.