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Finding the Fourth Proportional to 2,808.57, 3,874.80 and 1,689.87

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Solution

The fourth proportional to 2,808.57, 3,874.80 and 1,689.87 is: 2,331.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,808.57 : 3,874.80 = 1,689.87 : x
  2. Step 2: Convert to fraction form
    2,808.57/3,874.80 = 1,689.87/x
  3. Step 3: Cross multiply
    2,808.57x = 3,874.80 × 1,689.87
  4. Step 4: Simplify right side
    2,808.57x = 6,547,908.28
  5. Step 5: Solve for x
    x = 6,547,908.28/2,808.57
  6. Step 6: Final answer
    x = 2,331.40

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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.