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Finding the Fourth Proportional to 686.97, 1,029.60 and 253.62

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Solution

The fourth proportional to 686.97, 1,029.60 and 253.62 is: 380.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.97 : 1,029.60 = 253.62 : x
  2. Step 2: Convert to fraction form
    686.97/1,029.60 = 253.62/x
  3. Step 3: Cross multiply
    686.97x = 1,029.60 × 253.62
  4. Step 4: Simplify right side
    686.97x = 261,127.15
  5. Step 5: Solve for x
    x = 261,127.15/686.97
  6. Step 6: Final answer
    x = 380.11

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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.