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Finding the Fourth Proportional to 1,245.79, 1,869.09 and 628.98

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Solution

The fourth proportional to 1,245.79, 1,869.09 and 628.98 is: 943.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.79 : 1,869.09 = 628.98 : x
  2. Step 2: Convert to fraction form
    1,245.79/1,869.09 = 628.98/x
  3. Step 3: Cross multiply
    1,245.79x = 1,869.09 × 628.98
  4. Step 4: Simplify right side
    1,245.79x = 1,175,620.23
  5. Step 5: Solve for x
    x = 1,175,620.23/1,245.79
  6. Step 6: Final answer
    x = 943.67

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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.