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Finding the Fourth Proportional to 647.05, 969.76 and 338.73

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Solution

The fourth proportional to 647.05, 969.76 and 338.73 is: 507.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.05 : 969.76 = 338.73 : x
  2. Step 2: Convert to fraction form
    647.05/969.76 = 338.73/x
  3. Step 3: Cross multiply
    647.05x = 969.76 × 338.73
  4. Step 4: Simplify right side
    647.05x = 328,486.80
  5. Step 5: Solve for x
    x = 328,486.80/647.05
  6. Step 6: Final answer
    x = 507.67

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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.