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Finding the Fourth Proportional to 331.59, 458.06 and 315.39

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Solution

The fourth proportional to 331.59, 458.06 and 315.39 is: 435.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.59 : 458.06 = 315.39 : x
  2. Step 2: Convert to fraction form
    331.59/458.06 = 315.39/x
  3. Step 3: Cross multiply
    331.59x = 458.06 × 315.39
  4. Step 4: Simplify right side
    331.59x = 144,465.97
  5. Step 5: Solve for x
    x = 144,465.97/331.59
  6. Step 6: Final answer
    x = 435.68

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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.