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Finding the Fourth Proportional to 428.55, 590.85 and 349.79

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Solution

The fourth proportional to 428.55, 590.85 and 349.79 is: 482.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.55 : 590.85 = 349.79 : x
  2. Step 2: Convert to fraction form
    428.55/590.85 = 349.79/x
  3. Step 3: Cross multiply
    428.55x = 590.85 × 349.79
  4. Step 4: Simplify right side
    428.55x = 206,670.47
  5. Step 5: Solve for x
    x = 206,670.47/428.55
  6. Step 6: Final answer
    x = 482.26

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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.