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Finding the Fourth Proportional to 1,311.94, 1,966.20 and 662.32

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Solution

The fourth proportional to 1,311.94, 1,966.20 and 662.32 is: 992.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.94 : 1,966.20 = 662.32 : x
  2. Step 2: Convert to fraction form
    1,311.94/1,966.20 = 662.32/x
  3. Step 3: Cross multiply
    1,311.94x = 1,966.20 × 662.32
  4. Step 4: Simplify right side
    1,311.94x = 1,302,253.58
  5. Step 5: Solve for x
    x = 1,302,253.58/1,311.94
  6. Step 6: Final answer
    x = 992.62

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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.