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Finding the Fourth Proportional to 477, 658.55 and 311.67

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Solution

The fourth proportional to 477, 658.55 and 311.67 is: 430.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    477 : 658.55 = 311.67 : x
  2. Step 2: Convert to fraction form
    477/658.55 = 311.67/x
  3. Step 3: Cross multiply
    477x = 658.55 × 311.67
  4. Step 4: Simplify right side
    477x = 205,251.06
  5. Step 5: Solve for x
    x = 205,251.06/477
  6. Step 6: Final answer
    x = 430.30

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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.