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Finding the Fourth Proportional to 628.77, 868.14 and 481.15

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Solution

The fourth proportional to 628.77, 868.14 and 481.15 is: 664.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.77 : 868.14 = 481.15 : x
  2. Step 2: Convert to fraction form
    628.77/868.14 = 481.15/x
  3. Step 3: Cross multiply
    628.77x = 868.14 × 481.15
  4. Step 4: Simplify right side
    628.77x = 417,698.81
  5. Step 5: Solve for x
    x = 417,698.81/628.77
  6. Step 6: Final answer
    x = 664.31

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Half scale
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Double scale
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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.