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Finding the Fourth Proportional to 631.50, 945.70 and 521.13

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Solution

The fourth proportional to 631.50, 945.70 and 521.13 is: 780.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.50 : 945.70 = 521.13 : x
  2. Step 2: Convert to fraction form
    631.50/945.70 = 521.13/x
  3. Step 3: Cross multiply
    631.50x = 945.70 × 521.13
  4. Step 4: Simplify right side
    631.50x = 492,832.64
  5. Step 5: Solve for x
    x = 492,832.64/631.50
  6. Step 6: Final answer
    x = 780.42

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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.