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Finding the Fourth Proportional to 488.49, 673.90 and 311.40

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Solution

The fourth proportional to 488.49, 673.90 and 311.40 is: 429.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.49 : 673.90 = 311.40 : x
  2. Step 2: Convert to fraction form
    488.49/673.90 = 311.40/x
  3. Step 3: Cross multiply
    488.49x = 673.90 × 311.40
  4. Step 4: Simplify right side
    488.49x = 209,853.43
  5. Step 5: Solve for x
    x = 209,853.43/488.49
  6. Step 6: Final answer
    x = 429.60

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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.