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Finding the Fourth Proportional to 428.62, 591.56 and 317.92

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Solution

The fourth proportional to 428.62, 591.56 and 317.92 is: 438.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.62 : 591.56 = 317.92 : x
  2. Step 2: Convert to fraction form
    428.62/591.56 = 317.92/x
  3. Step 3: Cross multiply
    428.62x = 591.56 × 317.92
  4. Step 4: Simplify right side
    428.62x = 188,068.76
  5. Step 5: Solve for x
    x = 188,068.76/428.62
  6. Step 6: Final answer
    x = 438.78

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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.