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Finding the Fourth Proportional to 1,375.61, 2,063.39 and 644.67

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Solution

The fourth proportional to 1,375.61, 2,063.39 and 644.67 is: 966.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.61 : 2,063.39 = 644.67 : x
  2. Step 2: Convert to fraction form
    1,375.61/2,063.39 = 644.67/x
  3. Step 3: Cross multiply
    1,375.61x = 2,063.39 × 644.67
  4. Step 4: Simplify right side
    1,375.61x = 1,330,202.41
  5. Step 5: Solve for x
    x = 1,330,202.41/1,375.61
  6. Step 6: Final answer
    x = 966.99

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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.