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Finding the Fourth Proportional to 1,276.92, 1,762.12 and 717.38

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Solution

The fourth proportional to 1,276.92, 1,762.12 and 717.38 is: 989.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.92 : 1,762.12 = 717.38 : x
  2. Step 2: Convert to fraction form
    1,276.92/1,762.12 = 717.38/x
  3. Step 3: Cross multiply
    1,276.92x = 1,762.12 × 717.38
  4. Step 4: Simplify right side
    1,276.92x = 1,264,099.04
  5. Step 5: Solve for x
    x = 1,264,099.04/1,276.92
  6. Step 6: Final answer
    x = 989.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.