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Finding the Fourth Proportional to 631.93, 871.78 and 395.78

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Solution

The fourth proportional to 631.93, 871.78 and 395.78 is: 546.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.93 : 871.78 = 395.78 : x
  2. Step 2: Convert to fraction form
    631.93/871.78 = 395.78/x
  3. Step 3: Cross multiply
    631.93x = 871.78 × 395.78
  4. Step 4: Simplify right side
    631.93x = 345,033.09
  5. Step 5: Solve for x
    x = 345,033.09/631.93
  6. Step 6: Final answer
    x = 546.00

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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.