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Finding the Fourth Proportional to 686.31, 1,029.15 and 275.10

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Solution

The fourth proportional to 686.31, 1,029.15 and 275.10 is: 412.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.31 : 1,029.15 = 275.10 : x
  2. Step 2: Convert to fraction form
    686.31/1,029.15 = 275.10/x
  3. Step 3: Cross multiply
    686.31x = 1,029.15 × 275.10
  4. Step 4: Simplify right side
    686.31x = 283,119.17
  5. Step 5: Solve for x
    x = 283,119.17/686.31
  6. Step 6: Final answer
    x = 412.52

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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.