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Finding the Fourth Proportional to 1,329.38, 1,980.02 and 1,259.99

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Solution

The fourth proportional to 1,329.38, 1,980.02 and 1,259.99 is: 1,876.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.38 : 1,980.02 = 1,259.99 : x
  2. Step 2: Convert to fraction form
    1,329.38/1,980.02 = 1,259.99/x
  3. Step 3: Cross multiply
    1,329.38x = 1,980.02 × 1,259.99
  4. Step 4: Simplify right side
    1,329.38x = 2,494,795.50
  5. Step 5: Solve for x
    x = 2,494,795.50/1,329.38
  6. Step 6: Final answer
    x = 1,876.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.