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Finding the Fourth Proportional to 353.45, 487.67 and 311.73

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Solution

The fourth proportional to 353.45, 487.67 and 311.73 is: 430.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.45 : 487.67 = 311.73 : x
  2. Step 2: Convert to fraction form
    353.45/487.67 = 311.73/x
  3. Step 3: Cross multiply
    353.45x = 487.67 × 311.73
  4. Step 4: Simplify right side
    353.45x = 152,019.81
  5. Step 5: Solve for x
    x = 152,019.81/353.45
  6. Step 6: Final answer
    x = 430.11

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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.