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Finding the Fourth Proportional to 1,276.52, 1,911.72 and 659.36

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Solution

The fourth proportional to 1,276.52, 1,911.72 and 659.36 is: 987.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.52 : 1,911.72 = 659.36 : x
  2. Step 2: Convert to fraction form
    1,276.52/1,911.72 = 659.36/x
  3. Step 3: Cross multiply
    1,276.52x = 1,911.72 × 659.36
  4. Step 4: Simplify right side
    1,276.52x = 1,260,511.70
  5. Step 5: Solve for x
    x = 1,260,511.70/1,276.52
  6. Step 6: Final answer
    x = 987.46

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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.