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Finding the Fourth Proportional to 486.13, 670.75 and 311.44

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Solution

The fourth proportional to 486.13, 670.75 and 311.44 is: 429.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.13 : 670.75 = 311.44 : x
  2. Step 2: Convert to fraction form
    486.13/670.75 = 311.44/x
  3. Step 3: Cross multiply
    486.13x = 670.75 × 311.44
  4. Step 4: Simplify right side
    486.13x = 208,898.38
  5. Step 5: Solve for x
    x = 208,898.38/486.13
  6. Step 6: Final answer
    x = 429.72

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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.