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Finding the Fourth Proportional to 213.37, 320.05 and 76.43

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Solution

The fourth proportional to 213.37, 320.05 and 76.43 is: 114.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.37 : 320.05 = 76.43 : x
  2. Step 2: Convert to fraction form
    213.37/320.05 = 76.43/x
  3. Step 3: Cross multiply
    213.37x = 320.05 × 76.43
  4. Step 4: Simplify right side
    213.37x = 24,459.63
  5. Step 5: Solve for x
    x = 24,459.63/213.37
  6. Step 6: Final answer
    x = 114.64

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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.