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Finding the Fourth Proportional to 428.79, 591.18 and 281.17

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Solution

The fourth proportional to 428.79, 591.18 and 281.17 is: 387.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.79 : 591.18 = 281.17 : x
  2. Step 2: Convert to fraction form
    428.79/591.18 = 281.17/x
  3. Step 3: Cross multiply
    428.79x = 591.18 × 281.17
  4. Step 4: Simplify right side
    428.79x = 166,219.12
  5. Step 5: Solve for x
    x = 166,219.12/428.79
  6. Step 6: Final answer
    x = 387.65

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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.