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Finding the Fourth Proportional to 842.07, 1,261.82 and 431.31

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Solution

The fourth proportional to 842.07, 1,261.82 and 431.31 is: 646.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.07 : 1,261.82 = 431.31 : x
  2. Step 2: Convert to fraction form
    842.07/1,261.82 = 431.31/x
  3. Step 3: Cross multiply
    842.07x = 1,261.82 × 431.31
  4. Step 4: Simplify right side
    842.07x = 544,241.39
  5. Step 5: Solve for x
    x = 544,241.39/842.07
  6. Step 6: Final answer
    x = 646.31

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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.