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Finding the Fourth Proportional to 1,311.92, 1,967.40 and 446

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Solution

The fourth proportional to 1,311.92, 1,967.40 and 446 is: 668.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.92 : 1,967.40 = 446 : x
  2. Step 2: Convert to fraction form
    1,311.92/1,967.40 = 446/x
  3. Step 3: Cross multiply
    1,311.92x = 1,967.40 × 446
  4. Step 4: Simplify right side
    1,311.92x = 877,460.40
  5. Step 5: Solve for x
    x = 877,460.40/1,311.92
  6. Step 6: Final answer
    x = 668.84

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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.