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Finding the Fourth Proportional to 428.67, 591.03 and 405.59

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Solution

The fourth proportional to 428.67, 591.03 and 405.59 is: 559.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.67 : 591.03 = 405.59 : x
  2. Step 2: Convert to fraction form
    428.67/591.03 = 405.59/x
  3. Step 3: Cross multiply
    428.67x = 591.03 × 405.59
  4. Step 4: Simplify right side
    428.67x = 239,712.90
  5. Step 5: Solve for x
    x = 239,712.90/428.67
  6. Step 6: Final answer
    x = 559.20

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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.