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Finding the Fourth Proportional to 662.56, 914.28 and 382.78

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Solution

The fourth proportional to 662.56, 914.28 and 382.78 is: 528.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.56 : 914.28 = 382.78 : x
  2. Step 2: Convert to fraction form
    662.56/914.28 = 382.78/x
  3. Step 3: Cross multiply
    662.56x = 914.28 × 382.78
  4. Step 4: Simplify right side
    662.56x = 349,968.10
  5. Step 5: Solve for x
    x = 349,968.10/662.56
  6. Step 6: Final answer
    x = 528.21

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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.