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Finding the Fourth Proportional to 2,689.95, 3,711.95 and 1,805.61

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Solution

The fourth proportional to 2,689.95, 3,711.95 and 1,805.61 is: 2,491.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689.95 : 3,711.95 = 1,805.61 : x
  2. Step 2: Convert to fraction form
    2,689.95/3,711.95 = 1,805.61/x
  3. Step 3: Cross multiply
    2,689.95x = 3,711.95 × 1,805.61
  4. Step 4: Simplify right side
    2,689.95x = 6,702,325.01
  5. Step 5: Solve for x
    x = 6,702,325.01/2,689.95
  6. Step 6: Final answer
    x = 2,491.62

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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.