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Finding the Fourth Proportional to 445.62, 615.12 and 279.90

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Solution

The fourth proportional to 445.62, 615.12 and 279.90 is: 386.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.62 : 615.12 = 279.90 : x
  2. Step 2: Convert to fraction form
    445.62/615.12 = 279.90/x
  3. Step 3: Cross multiply
    445.62x = 615.12 × 279.90
  4. Step 4: Simplify right side
    445.62x = 172,172.09
  5. Step 5: Solve for x
    x = 172,172.09/445.62
  6. Step 6: Final answer
    x = 386.37

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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.