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Finding the Fourth Proportional to 216.34, 324.51 and 70.09

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Solution

The fourth proportional to 216.34, 324.51 and 70.09 is: 105.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.34 : 324.51 = 70.09 : x
  2. Step 2: Convert to fraction form
    216.34/324.51 = 70.09/x
  3. Step 3: Cross multiply
    216.34x = 324.51 × 70.09
  4. Step 4: Simplify right side
    216.34x = 22,744.91
  5. Step 5: Solve for x
    x = 22,744.91/216.34
  6. Step 6: Final answer
    x = 105.14

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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.