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Finding the Fourth Proportional to 445.81, 615.09 and 256.72

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Solution

The fourth proportional to 445.81, 615.09 and 256.72 is: 354.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.81 : 615.09 = 256.72 : x
  2. Step 2: Convert to fraction form
    445.81/615.09 = 256.72/x
  3. Step 3: Cross multiply
    445.81x = 615.09 × 256.72
  4. Step 4: Simplify right side
    445.81x = 157,905.90
  5. Step 5: Solve for x
    x = 157,905.90/445.81
  6. Step 6: Final answer
    x = 354.20

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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.