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Finding the Fourth Proportional to 1,367.64, 2,051.44 and 636.80

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Solution

The fourth proportional to 1,367.64, 2,051.44 and 636.80 is: 955.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,367.64 : 2,051.44 = 636.80 : x
  2. Step 2: Convert to fraction form
    1,367.64/2,051.44 = 636.80/x
  3. Step 3: Cross multiply
    1,367.64x = 2,051.44 × 636.80
  4. Step 4: Simplify right side
    1,367.64x = 1,306,356.99
  5. Step 5: Solve for x
    x = 1,306,356.99/1,367.64
  6. Step 6: Final answer
    x = 955.19

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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.