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Finding the Fourth Proportional to 213.36, 320.10 and 69.12

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Solution

The fourth proportional to 213.36, 320.10 and 69.12 is: 103.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.36 : 320.10 = 69.12 : x
  2. Step 2: Convert to fraction form
    213.36/320.10 = 69.12/x
  3. Step 3: Cross multiply
    213.36x = 320.10 × 69.12
  4. Step 4: Simplify right side
    213.36x = 22,125.31
  5. Step 5: Solve for x
    x = 22,125.31/213.36
  6. Step 6: Final answer
    x = 103.70

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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.