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Finding the Fourth Proportional to 476.18, 657.21 and 310.64

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Solution

The fourth proportional to 476.18, 657.21 and 310.64 is: 428.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.18 : 657.21 = 310.64 : x
  2. Step 2: Convert to fraction form
    476.18/657.21 = 310.64/x
  3. Step 3: Cross multiply
    476.18x = 657.21 × 310.64
  4. Step 4: Simplify right side
    476.18x = 204,153.59
  5. Step 5: Solve for x
    x = 204,153.59/476.18
  6. Step 6: Final answer
    x = 428.73

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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.