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Finding the Fourth Proportional to 1,581.52, 2,372.01 and 427

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Solution

The fourth proportional to 1,581.52, 2,372.01 and 427 is: 640.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.52 : 2,372.01 = 427 : x
  2. Step 2: Convert to fraction form
    1,581.52/2,372.01 = 427/x
  3. Step 3: Cross multiply
    1,581.52x = 2,372.01 × 427
  4. Step 4: Simplify right side
    1,581.52x = 1,012,848.27
  5. Step 5: Solve for x
    x = 1,012,848.27/1,581.52
  6. Step 6: Final answer
    x = 640.43

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.