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Finding the Fourth Proportional to 461.96, 637.40 and 287.21

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Solution

The fourth proportional to 461.96, 637.40 and 287.21 is: 396.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.96 : 637.40 = 287.21 : x
  2. Step 2: Convert to fraction form
    461.96/637.40 = 287.21/x
  3. Step 3: Cross multiply
    461.96x = 637.40 × 287.21
  4. Step 4: Simplify right side
    461.96x = 183,066.22
  5. Step 5: Solve for x
    x = 183,066.22/461.96
  6. Step 6: Final answer
    x = 396.28

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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.