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Finding the Fourth Proportional to 445.14, 667.08 and 420.50

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Solution

The fourth proportional to 445.14, 667.08 and 420.50 is: 630.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.14 : 667.08 = 420.50 : x
  2. Step 2: Convert to fraction form
    445.14/667.08 = 420.50/x
  3. Step 3: Cross multiply
    445.14x = 667.08 × 420.50
  4. Step 4: Simplify right side
    445.14x = 280,505.06
  5. Step 5: Solve for x
    x = 280,505.06/445.14
  6. Step 6: Final answer
    x = 630.15

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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.