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Finding the Fourth Proportional to 445.30, 666.15 and 385.10

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Solution

The fourth proportional to 445.30, 666.15 and 385.10 is: 576.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.30 : 666.15 = 385.10 : x
  2. Step 2: Convert to fraction form
    445.30/666.15 = 385.10/x
  3. Step 3: Cross multiply
    445.30x = 666.15 × 385.10
  4. Step 4: Simplify right side
    445.30x = 256,534.37
  5. Step 5: Solve for x
    x = 256,534.37/445.30
  6. Step 6: Final answer
    x = 576.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.