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Finding the Fourth Proportional to 458.08, 687.18 and 214.48

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Solution

The fourth proportional to 458.08, 687.18 and 214.48 is: 321.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.08 : 687.18 = 214.48 : x
  2. Step 2: Convert to fraction form
    458.08/687.18 = 214.48/x
  3. Step 3: Cross multiply
    458.08x = 687.18 × 214.48
  4. Step 4: Simplify right side
    458.08x = 147,386.37
  5. Step 5: Solve for x
    x = 147,386.37/458.08
  6. Step 6: Final answer
    x = 321.75

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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.