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Finding the Fourth Proportional to 458.40, 687.29 and 220.82

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Solution

The fourth proportional to 458.40, 687.29 and 220.82 is: 331.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.40 : 687.29 = 220.82 : x
  2. Step 2: Convert to fraction form
    458.40/687.29 = 220.82/x
  3. Step 3: Cross multiply
    458.40x = 687.29 × 220.82
  4. Step 4: Simplify right side
    458.40x = 151,762.84
  5. Step 5: Solve for x
    x = 151,762.84/458.40
  6. Step 6: Final answer
    x = 331.07

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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.