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Finding the Fourth Proportional to 445.48, 662.93 and 428.20

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Solution

The fourth proportional to 445.48, 662.93 and 428.20 is: 637.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.48 : 662.93 = 428.20 : x
  2. Step 2: Convert to fraction form
    445.48/662.93 = 428.20/x
  3. Step 3: Cross multiply
    445.48x = 662.93 × 428.20
  4. Step 4: Simplify right side
    445.48x = 283,866.63
  5. Step 5: Solve for x
    x = 283,866.63/445.48
  6. Step 6: Final answer
    x = 637.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.