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Finding the Fourth Proportional to 445.43, 615.04 and 305.55

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Solution

The fourth proportional to 445.43, 615.04 and 305.55 is: 421.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.43 : 615.04 = 305.55 : x
  2. Step 2: Convert to fraction form
    445.43/615.04 = 305.55/x
  3. Step 3: Cross multiply
    445.43x = 615.04 × 305.55
  4. Step 4: Simplify right side
    445.43x = 187,924.71
  5. Step 5: Solve for x
    x = 187,924.71/445.43
  6. Step 6: Final answer
    x = 421.89

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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.