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Finding the Fourth Proportional to 213.84, 318.96 and 191.28

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Solution

The fourth proportional to 213.84, 318.96 and 191.28 is: 285.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.84 : 318.96 = 191.28 : x
  2. Step 2: Convert to fraction form
    213.84/318.96 = 191.28/x
  3. Step 3: Cross multiply
    213.84x = 318.96 × 191.28
  4. Step 4: Simplify right side
    213.84x = 61,010.67
  5. Step 5: Solve for x
    x = 61,010.67/213.84
  6. Step 6: Final answer
    x = 285.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.