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Finding the Fourth Proportional to 316.66, 474.76 and 213.69

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Solution

The fourth proportional to 316.66, 474.76 and 213.69 is: 320.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.66 : 474.76 = 213.69 : x
  2. Step 2: Convert to fraction form
    316.66/474.76 = 213.69/x
  3. Step 3: Cross multiply
    316.66x = 474.76 × 213.69
  4. Step 4: Simplify right side
    316.66x = 101,450.84
  5. Step 5: Solve for x
    x = 101,450.84/316.66
  6. Step 6: Final answer
    x = 320.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.