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Finding the Fourth Proportional to 631.51, 945.28 and 399.59

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Solution

The fourth proportional to 631.51, 945.28 and 399.59 is: 598.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.51 : 945.28 = 399.59 : x
  2. Step 2: Convert to fraction form
    631.51/945.28 = 399.59/x
  3. Step 3: Cross multiply
    631.51x = 945.28 × 399.59
  4. Step 4: Simplify right side
    631.51x = 377,722.44
  5. Step 5: Solve for x
    x = 377,722.44/631.51
  6. Step 6: Final answer
    x = 598.13

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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.