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Finding the Fourth Proportional to 631.21, 945.27 and 520.85

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Solution

The fourth proportional to 631.21, 945.27 and 520.85 is: 780.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.21 : 945.27 = 520.85 : x
  2. Step 2: Convert to fraction form
    631.21/945.27 = 520.85/x
  3. Step 3: Cross multiply
    631.21x = 945.27 × 520.85
  4. Step 4: Simplify right side
    631.21x = 492,343.88
  5. Step 5: Solve for x
    x = 492,343.88/631.21
  6. Step 6: Final answer
    x = 780.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.