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Finding the Fourth Proportional to 662.61, 914.20 and 382.81

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Solution

The fourth proportional to 662.61, 914.20 and 382.81 is: 528.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.61 : 914.20 = 382.81 : x
  2. Step 2: Convert to fraction form
    662.61/914.20 = 382.81/x
  3. Step 3: Cross multiply
    662.61x = 914.20 × 382.81
  4. Step 4: Simplify right side
    662.61x = 349,964.90
  5. Step 5: Solve for x
    x = 349,964.90/662.61
  6. Step 6: Final answer
    x = 528.16

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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.