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Finding the Fourth Proportional to 213.36, 320.08 and 69.08

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Solution

The fourth proportional to 213.36, 320.08 and 69.08 is: 103.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.36 : 320.08 = 69.08 : x
  2. Step 2: Convert to fraction form
    213.36/320.08 = 69.08/x
  3. Step 3: Cross multiply
    213.36x = 320.08 × 69.08
  4. Step 4: Simplify right side
    213.36x = 22,111.13
  5. Step 5: Solve for x
    x = 22,111.13/213.36
  6. Step 6: Final answer
    x = 103.63

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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.