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Finding the Fourth Proportional to 1,276.92, 1,914.96 and 866.28

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Solution

The fourth proportional to 1,276.92, 1,914.96 and 866.28 is: 1,299.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.92 : 1,914.96 = 866.28 : x
  2. Step 2: Convert to fraction form
    1,276.92/1,914.96 = 866.28/x
  3. Step 3: Cross multiply
    1,276.92x = 1,914.96 × 866.28
  4. Step 4: Simplify right side
    1,276.92x = 1,658,891.55
  5. Step 5: Solve for x
    x = 1,658,891.55/1,276.92
  6. Step 6: Final answer
    x = 1,299.14

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1.5x scale

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.