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Finding the Fourth Proportional to 213.40, 320.46 and 105.40

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Solution

The fourth proportional to 213.40, 320.46 and 105.40 is: 158.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.40 : 320.46 = 105.40 : x
  2. Step 2: Convert to fraction form
    213.40/320.46 = 105.40/x
  3. Step 3: Cross multiply
    213.40x = 320.46 × 105.40
  4. Step 4: Simplify right side
    213.40x = 33,776.48
  5. Step 5: Solve for x
    x = 33,776.48/213.40
  6. Step 6: Final answer
    x = 158.28

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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.