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Finding the Fourth Proportional to 457.73, 687 and 214.40

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Solution

The fourth proportional to 457.73, 687 and 214.40 is: 321.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.73 : 687 = 214.40 : x
  2. Step 2: Convert to fraction form
    457.73/687 = 214.40/x
  3. Step 3: Cross multiply
    457.73x = 687 × 214.40
  4. Step 4: Simplify right side
    457.73x = 147,289.37
  5. Step 5: Solve for x
    x = 147,289.37/457.73
  6. Step 6: Final answer
    x = 321.78

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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.