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Finding the Fourth Proportional to 318.51, 481.25 and 316.69

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Solution

The fourth proportional to 318.51, 481.25 and 316.69 is: 478.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.51 : 481.25 = 316.69 : x
  2. Step 2: Convert to fraction form
    318.51/481.25 = 316.69/x
  3. Step 3: Cross multiply
    318.51x = 481.25 × 316.69
  4. Step 4: Simplify right side
    318.51x = 152,406.65
  5. Step 5: Solve for x
    x = 152,406.65/318.51
  6. Step 6: Final answer
    x = 478.50

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.