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Finding the Fourth Proportional to 213.85, 320.70 and 69.53

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Solution

The fourth proportional to 213.85, 320.70 and 69.53 is: 104.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.85 : 320.70 = 69.53 : x
  2. Step 2: Convert to fraction form
    213.85/320.70 = 69.53/x
  3. Step 3: Cross multiply
    213.85x = 320.70 × 69.53
  4. Step 4: Simplify right side
    213.85x = 22,298.27
  5. Step 5: Solve for x
    x = 22,298.27/213.85
  6. Step 6: Final answer
    x = 104.27

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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.