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Finding the Fourth Proportional to 2,689.85, 3,711.87 and 1,511.30

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Solution

The fourth proportional to 2,689.85, 3,711.87 and 1,511.30 is: 2,085.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689.85 : 3,711.87 = 1,511.30 : x
  2. Step 2: Convert to fraction form
    2,689.85/3,711.87 = 1,511.30/x
  3. Step 3: Cross multiply
    2,689.85x = 3,711.87 × 1,511.30
  4. Step 4: Simplify right side
    2,689.85x = 5,609,730.57
  5. Step 5: Solve for x
    x = 5,609,730.57/2,689.85
  6. Step 6: Final answer
    x = 2,085.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.