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Finding the Fourth Proportional to 619.70, 929.07 and 311.39

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Solution

The fourth proportional to 619.70, 929.07 and 311.39 is: 466.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.70 : 929.07 = 311.39 : x
  2. Step 2: Convert to fraction form
    619.70/929.07 = 311.39/x
  3. Step 3: Cross multiply
    619.70x = 929.07 × 311.39
  4. Step 4: Simplify right side
    619.70x = 289,307.17
  5. Step 5: Solve for x
    x = 289,307.17/619.70
  6. Step 6: Final answer
    x = 466.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.