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Finding the Fourth Proportional to 457.95, 687.06 and 214.50

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Solution

The fourth proportional to 457.95, 687.06 and 214.50 is: 321.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.95 : 687.06 = 214.50 : x
  2. Step 2: Convert to fraction form
    457.95/687.06 = 214.50/x
  3. Step 3: Cross multiply
    457.95x = 687.06 × 214.50
  4. Step 4: Simplify right side
    457.95x = 147,374.37
  5. Step 5: Solve for x
    x = 147,374.37/457.95
  6. Step 6: Final answer
    x = 321.81

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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.