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Finding the Fourth Proportional to 893.06, 1,339.79 and 431.23

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Solution

The fourth proportional to 893.06, 1,339.79 and 431.23 is: 646.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.06 : 1,339.79 = 431.23 : x
  2. Step 2: Convert to fraction form
    893.06/1,339.79 = 431.23/x
  3. Step 3: Cross multiply
    893.06x = 1,339.79 × 431.23
  4. Step 4: Simplify right side
    893.06x = 577,757.64
  5. Step 5: Solve for x
    x = 577,757.64/893.06
  6. Step 6: Final answer
    x = 646.94

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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.