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Finding the Fourth Proportional to 428.75, 591.52 and 281.46

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Solution

The fourth proportional to 428.75, 591.52 and 281.46 is: 388.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.75 : 591.52 = 281.46 : x
  2. Step 2: Convert to fraction form
    428.75/591.52 = 281.46/x
  3. Step 3: Cross multiply
    428.75x = 591.52 × 281.46
  4. Step 4: Simplify right side
    428.75x = 166,488.52
  5. Step 5: Solve for x
    x = 166,488.52/428.75
  6. Step 6: Final answer
    x = 388.32

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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.