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Finding the Fourth Proportional to 316.13, 436.80 and 276.65

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Solution

The fourth proportional to 316.13, 436.80 and 276.65 is: 382.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.13 : 436.80 = 276.65 : x
  2. Step 2: Convert to fraction form
    316.13/436.80 = 276.65/x
  3. Step 3: Cross multiply
    316.13x = 436.80 × 276.65
  4. Step 4: Simplify right side
    316.13x = 120,840.72
  5. Step 5: Solve for x
    x = 120,840.72/316.13
  6. Step 6: Final answer
    x = 382.25

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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.