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Finding the Fourth Proportional to 829.82, 1,244.63 and 520.75

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Solution

The fourth proportional to 829.82, 1,244.63 and 520.75 is: 781.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.82 : 1,244.63 = 520.75 : x
  2. Step 2: Convert to fraction form
    829.82/1,244.63 = 520.75/x
  3. Step 3: Cross multiply
    829.82x = 1,244.63 × 520.75
  4. Step 4: Simplify right side
    829.82x = 648,141.07
  5. Step 5: Solve for x
    x = 648,141.07/829.82
  6. Step 6: Final answer
    x = 781.07

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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.