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Finding the Fourth Proportional to 1,271.97, 1,907.34 and 686.85

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Solution

The fourth proportional to 1,271.97, 1,907.34 and 686.85 is: 1,029.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.97 : 1,907.34 = 686.85 : x
  2. Step 2: Convert to fraction form
    1,271.97/1,907.34 = 686.85/x
  3. Step 3: Cross multiply
    1,271.97x = 1,907.34 × 686.85
  4. Step 4: Simplify right side
    1,271.97x = 1,310,056.48
  5. Step 5: Solve for x
    x = 1,310,056.48/1,271.97
  6. Step 6: Final answer
    x = 1,029.94

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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.