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Finding the Fourth Proportional to 476.42, 657.31 and 310.87

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Solution

The fourth proportional to 476.42, 657.31 and 310.87 is: 428.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.42 : 657.31 = 310.87 : x
  2. Step 2: Convert to fraction form
    476.42/657.31 = 310.87/x
  3. Step 3: Cross multiply
    476.42x = 657.31 × 310.87
  4. Step 4: Simplify right side
    476.42x = 204,337.96
  5. Step 5: Solve for x
    x = 204,337.96/476.42
  6. Step 6: Final answer
    x = 428.90

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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.