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Finding the Fourth Proportional to 428.04, 590.63 and 280.89

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Solution

The fourth proportional to 428.04, 590.63 and 280.89 is: 387.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.04 : 590.63 = 280.89 : x
  2. Step 2: Convert to fraction form
    428.04/590.63 = 280.89/x
  3. Step 3: Cross multiply
    428.04x = 590.63 × 280.89
  4. Step 4: Simplify right side
    428.04x = 165,900.66
  5. Step 5: Solve for x
    x = 165,900.66/428.04
  6. Step 6: Final answer
    x = 387.58

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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.