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Finding the Fourth Proportional to 431.04, 645.96 and 214.76

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Solution

The fourth proportional to 431.04, 645.96 and 214.76 is: 321.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.04 : 645.96 = 214.76 : x
  2. Step 2: Convert to fraction form
    431.04/645.96 = 214.76/x
  3. Step 3: Cross multiply
    431.04x = 645.96 × 214.76
  4. Step 4: Simplify right side
    431.04x = 138,726.37
  5. Step 5: Solve for x
    x = 138,726.37/431.04
  6. Step 6: Final answer
    x = 321.84

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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.