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Finding the Fourth Proportional to 1,581.43, 2,181.81 and 917.92

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Solution

The fourth proportional to 1,581.43, 2,181.81 and 917.92 is: 1,266.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.43 : 2,181.81 = 917.92 : x
  2. Step 2: Convert to fraction form
    1,581.43/2,181.81 = 917.92/x
  3. Step 3: Cross multiply
    1,581.43x = 2,181.81 × 917.92
  4. Step 4: Simplify right side
    1,581.43x = 2,002,727.04
  5. Step 5: Solve for x
    x = 2,002,727.04/1,581.43
  6. Step 6: Final answer
    x = 1,266.40

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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.