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Finding the Fourth Proportional to 686.25, 1,029.26 and 275.28

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Solution

The fourth proportional to 686.25, 1,029.26 and 275.28 is: 412.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.25 : 1,029.26 = 275.28 : x
  2. Step 2: Convert to fraction form
    686.25/1,029.26 = 275.28/x
  3. Step 3: Cross multiply
    686.25x = 1,029.26 × 275.28
  4. Step 4: Simplify right side
    686.25x = 283,335.38
  5. Step 5: Solve for x
    x = 283,335.38/686.25
  6. Step 6: Final answer
    x = 412.87

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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.