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Finding the Fourth Proportional to 213.66, 320.45 and 83.72

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Solution

The fourth proportional to 213.66, 320.45 and 83.72 is: 125.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.66 : 320.45 = 83.72 : x
  2. Step 2: Convert to fraction form
    213.66/320.45 = 83.72/x
  3. Step 3: Cross multiply
    213.66x = 320.45 × 83.72
  4. Step 4: Simplify right side
    213.66x = 26,828.07
  5. Step 5: Solve for x
    x = 26,828.07/213.66
  6. Step 6: Final answer
    x = 125.56

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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.