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Finding the Fourth Proportional to 676.88, 1,015.71 and 286.84

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Solution

The fourth proportional to 676.88, 1,015.71 and 286.84 is: 430.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.88 : 1,015.71 = 286.84 : x
  2. Step 2: Convert to fraction form
    676.88/1,015.71 = 286.84/x
  3. Step 3: Cross multiply
    676.88x = 1,015.71 × 286.84
  4. Step 4: Simplify right side
    676.88x = 291,346.45
  5. Step 5: Solve for x
    x = 291,346.45/676.88
  6. Step 6: Final answer
    x = 430.43

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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.