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Finding the Fourth Proportional to 829.82, 1,145.31 and 480.50

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Solution

The fourth proportional to 829.82, 1,145.31 and 480.50 is: 663.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.82 : 1,145.31 = 480.50 : x
  2. Step 2: Convert to fraction form
    829.82/1,145.31 = 480.50/x
  3. Step 3: Cross multiply
    829.82x = 1,145.31 × 480.50
  4. Step 4: Simplify right side
    829.82x = 550,321.46
  5. Step 5: Solve for x
    x = 550,321.46/829.82
  6. Step 6: Final answer
    x = 663.18

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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.