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Finding the Fourth Proportional to 1,561.52, 2,342.82 and 636.80

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Solution

The fourth proportional to 1,561.52, 2,342.82 and 636.80 is: 955.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.52 : 2,342.82 = 636.80 : x
  2. Step 2: Convert to fraction form
    1,561.52/2,342.82 = 636.80/x
  3. Step 3: Cross multiply
    1,561.52x = 2,342.82 × 636.80
  4. Step 4: Simplify right side
    1,561.52x = 1,491,907.78
  5. Step 5: Solve for x
    x = 1,491,907.78/1,561.52
  6. Step 6: Final answer
    x = 955.42

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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.