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Finding the Fourth Proportional to 676.49, 1,015.94 and 431.06

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Solution

The fourth proportional to 676.49, 1,015.94 and 431.06 is: 647.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.49 : 1,015.94 = 431.06 : x
  2. Step 2: Convert to fraction form
    676.49/1,015.94 = 431.06/x
  3. Step 3: Cross multiply
    676.49x = 1,015.94 × 431.06
  4. Step 4: Simplify right side
    676.49x = 437,927.09
  5. Step 5: Solve for x
    x = 437,927.09/676.49
  6. Step 6: Final answer
    x = 647.36

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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.