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Finding the Fourth Proportional to 1,581.21, 2,181.83 and 882.45

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Solution

The fourth proportional to 1,581.21, 2,181.83 and 882.45 is: 1,217.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.21 : 2,181.83 = 882.45 : x
  2. Step 2: Convert to fraction form
    1,581.21/2,181.83 = 882.45/x
  3. Step 3: Cross multiply
    1,581.21x = 2,181.83 × 882.45
  4. Step 4: Simplify right side
    1,581.21x = 1,925,351.47
  5. Step 5: Solve for x
    x = 1,925,351.47/1,581.21
  6. Step 6: Final answer
    x = 1,217.64

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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.