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Finding the Fourth Proportional to 458.09, 631.56 and 379.12

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Solution

The fourth proportional to 458.09, 631.56 and 379.12 is: 522.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.09 : 631.56 = 379.12 : x
  2. Step 2: Convert to fraction form
    458.09/631.56 = 379.12/x
  3. Step 3: Cross multiply
    458.09x = 631.56 × 379.12
  4. Step 4: Simplify right side
    458.09x = 239,433.55
  5. Step 5: Solve for x
    x = 239,433.55/458.09
  6. Step 6: Final answer
    x = 522.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.