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Finding the Fourth Proportional to 476.55, 657.72 and 310.68

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Solution

The fourth proportional to 476.55, 657.72 and 310.68 is: 428.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.55 : 657.72 = 310.68 : x
  2. Step 2: Convert to fraction form
    476.55/657.72 = 310.68/x
  3. Step 3: Cross multiply
    476.55x = 657.72 × 310.68
  4. Step 4: Simplify right side
    476.55x = 204,340.45
  5. Step 5: Solve for x
    x = 204,340.45/476.55
  6. Step 6: Final answer
    x = 428.79

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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.