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Finding the Fourth Proportional to 829.12, 1,243.05 and 646.90

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Solution

The fourth proportional to 829.12, 1,243.05 and 646.90 is: 969.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.12 : 1,243.05 = 646.90 : x
  2. Step 2: Convert to fraction form
    829.12/1,243.05 = 646.90/x
  3. Step 3: Cross multiply
    829.12x = 1,243.05 × 646.90
  4. Step 4: Simplify right side
    829.12x = 804,129.05
  5. Step 5: Solve for x
    x = 804,129.05/829.12
  6. Step 6: Final answer
    x = 969.86

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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.