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Finding the Fourth Proportional to 445.70, 615.09 and 279.86

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Solution

The fourth proportional to 445.70, 615.09 and 279.86 is: 386.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.70 : 615.09 = 279.86 : x
  2. Step 2: Convert to fraction form
    445.70/615.09 = 279.86/x
  3. Step 3: Cross multiply
    445.70x = 615.09 × 279.86
  4. Step 4: Simplify right side
    445.70x = 172,137.06
  5. Step 5: Solve for x
    x = 172,137.06/445.70
  6. Step 6: Final answer
    x = 386.22

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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.