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Finding the Fourth Proportional to 214.71, 321.53 and 153.81

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Solution

The fourth proportional to 214.71, 321.53 and 153.81 is: 230.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.71 : 321.53 = 153.81 : x
  2. Step 2: Convert to fraction form
    214.71/321.53 = 153.81/x
  3. Step 3: Cross multiply
    214.71x = 321.53 × 153.81
  4. Step 4: Simplify right side
    214.71x = 49,453.76
  5. Step 5: Solve for x
    x = 49,453.76/214.71
  6. Step 6: Final answer
    x = 230.33

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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.