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Finding the Fourth Proportional to 829.60, 1,239.56 and 829.60

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Solution

The fourth proportional to 829.60, 1,239.56 and 829.60 is: 1,239.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.60 : 1,239.56 = 829.60 : x
  2. Step 2: Convert to fraction form
    829.60/1,239.56 = 829.60/x
  3. Step 3: Cross multiply
    829.60x = 1,239.56 × 829.60
  4. Step 4: Simplify right side
    829.60x = 1,028,338.98
  5. Step 5: Solve for x
    x = 1,028,338.98/829.60
  6. Step 6: Final answer
    x = 1,239.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.