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Finding the Fourth Proportional to 1,311.88, 1,968.08 and 446.28

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Solution

The fourth proportional to 1,311.88, 1,968.08 and 446.28 is: 669.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.88 : 1,968.08 = 446.28 : x
  2. Step 2: Convert to fraction form
    1,311.88/1,968.08 = 446.28/x
  3. Step 3: Cross multiply
    1,311.88x = 1,968.08 × 446.28
  4. Step 4: Simplify right side
    1,311.88x = 878,314.74
  5. Step 5: Solve for x
    x = 878,314.74/1,311.88
  6. Step 6: Final answer
    x = 669.51

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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.