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Finding the Fourth Proportional to 475.80, 656.80 and 310.16

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Solution

The fourth proportional to 475.80, 656.80 and 310.16 is: 428.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.80 : 656.80 = 310.16 : x
  2. Step 2: Convert to fraction form
    475.80/656.80 = 310.16/x
  3. Step 3: Cross multiply
    475.80x = 656.80 × 310.16
  4. Step 4: Simplify right side
    475.80x = 203,713.09
  5. Step 5: Solve for x
    x = 203,713.09/475.80
  6. Step 6: Final answer
    x = 428.15

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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.