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Finding the Fourth Proportional to 476.80, 657.75 and 311.06

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Solution

The fourth proportional to 476.80, 657.75 and 311.06 is: 429.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.80 : 657.75 = 311.06 : x
  2. Step 2: Convert to fraction form
    476.80/657.75 = 311.06/x
  3. Step 3: Cross multiply
    476.80x = 657.75 × 311.06
  4. Step 4: Simplify right side
    476.80x = 204,599.72
  5. Step 5: Solve for x
    x = 204,599.72/476.80
  6. Step 6: Final answer
    x = 429.11

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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.