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Finding the Fourth Proportional to 1,679.67, 2,519.51 and 1,390.50

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Solution

The fourth proportional to 1,679.67, 2,519.51 and 1,390.50 is: 2,085.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.67 : 2,519.51 = 1,390.50 : x
  2. Step 2: Convert to fraction form
    1,679.67/2,519.51 = 1,390.50/x
  3. Step 3: Cross multiply
    1,679.67x = 2,519.51 × 1,390.50
  4. Step 4: Simplify right side
    1,679.67x = 3,503,371.70
  5. Step 5: Solve for x
    x = 3,503,371.70/1,679.67
  6. Step 6: Final answer
    x = 2,085.75

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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.