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Finding the Fourth Proportional to 428.29, 591.62 and 318.34

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Solution

The fourth proportional to 428.29, 591.62 and 318.34 is: 439.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.29 : 591.62 = 318.34 : x
  2. Step 2: Convert to fraction form
    428.29/591.62 = 318.34/x
  3. Step 3: Cross multiply
    428.29x = 591.62 × 318.34
  4. Step 4: Simplify right side
    428.29x = 188,331.76
  5. Step 5: Solve for x
    x = 188,331.76/428.29
  6. Step 6: Final answer
    x = 439.73

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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.