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Finding the Fourth Proportional to 619.52, 855.20 and 445.60

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Solution

The fourth proportional to 619.52, 855.20 and 445.60 is: 615.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.52 : 855.20 = 445.60 : x
  2. Step 2: Convert to fraction form
    619.52/855.20 = 445.60/x
  3. Step 3: Cross multiply
    619.52x = 855.20 × 445.60
  4. Step 4: Simplify right side
    619.52x = 381,077.12
  5. Step 5: Solve for x
    x = 381,077.12/619.52
  6. Step 6: Final answer
    x = 615.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.