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Finding the Fourth Proportional to 829.97, 1,145.31 and 475.81

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Solution

The fourth proportional to 829.97, 1,145.31 and 475.81 is: 656.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.97 : 1,145.31 = 475.81 : x
  2. Step 2: Convert to fraction form
    829.97/1,145.31 = 475.81/x
  3. Step 3: Cross multiply
    829.97x = 1,145.31 × 475.81
  4. Step 4: Simplify right side
    829.97x = 544,952.46
  5. Step 5: Solve for x
    x = 544,952.46/829.97
  6. Step 6: Final answer
    x = 656.59

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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.