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Finding the Fourth Proportional to 428.70, 591.94 and 319.34

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Solution

The fourth proportional to 428.70, 591.94 and 319.34 is: 440.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.70 : 591.94 = 319.34 : x
  2. Step 2: Convert to fraction form
    428.70/591.94 = 319.34/x
  3. Step 3: Cross multiply
    428.70x = 591.94 × 319.34
  4. Step 4: Simplify right side
    428.70x = 189,030.12
  5. Step 5: Solve for x
    x = 189,030.12/428.70
  6. Step 6: Final answer
    x = 440.94

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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.