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Finding the Fourth Proportional to 631.48, 871.30 and 382.80

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Solution

The fourth proportional to 631.48, 871.30 and 382.80 is: 528.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.48 : 871.30 = 382.80 : x
  2. Step 2: Convert to fraction form
    631.48/871.30 = 382.80/x
  3. Step 3: Cross multiply
    631.48x = 871.30 × 382.80
  4. Step 4: Simplify right side
    631.48x = 333,533.64
  5. Step 5: Solve for x
    x = 333,533.64/631.48
  6. Step 6: Final answer
    x = 528.18

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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.