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Finding the Fourth Proportional to 488.70, 674.28 and 311.58

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Solution

The fourth proportional to 488.70, 674.28 and 311.58 is: 429.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.70 : 674.28 = 311.58 : x
  2. Step 2: Convert to fraction form
    488.70/674.28 = 311.58/x
  3. Step 3: Cross multiply
    488.70x = 674.28 × 311.58
  4. Step 4: Simplify right side
    488.70x = 210,092.16
  5. Step 5: Solve for x
    x = 210,092.16/488.70
  6. Step 6: Final answer
    x = 429.90

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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.