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Finding the Fourth Proportional to 631.15, 870.91 and 351.33

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Solution

The fourth proportional to 631.15, 870.91 and 351.33 is: 484.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.15 : 870.91 = 351.33 : x
  2. Step 2: Convert to fraction form
    631.15/870.91 = 351.33/x
  3. Step 3: Cross multiply
    631.15x = 870.91 × 351.33
  4. Step 4: Simplify right side
    631.15x = 305,976.81
  5. Step 5: Solve for x
    x = 305,976.81/631.15
  6. Step 6: Final answer
    x = 484.79

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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.