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Finding the Fourth Proportional to 428.01, 590.49 and 311.37

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Solution

The fourth proportional to 428.01, 590.49 and 311.37 is: 429.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.01 : 590.49 = 311.37 : x
  2. Step 2: Convert to fraction form
    428.01/590.49 = 311.37/x
  3. Step 3: Cross multiply
    428.01x = 590.49 × 311.37
  4. Step 4: Simplify right side
    428.01x = 183,860.87
  5. Step 5: Solve for x
    x = 183,860.87/428.01
  6. Step 6: Final answer
    x = 429.57

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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.