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Finding the Fourth Proportional to 1,272.81, 1,909.21 and 541.92

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Solution

The fourth proportional to 1,272.81, 1,909.21 and 541.92 is: 812.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.81 : 1,909.21 = 541.92 : x
  2. Step 2: Convert to fraction form
    1,272.81/1,909.21 = 541.92/x
  3. Step 3: Cross multiply
    1,272.81x = 1,909.21 × 541.92
  4. Step 4: Simplify right side
    1,272.81x = 1,034,639.08
  5. Step 5: Solve for x
    x = 1,034,639.08/1,272.81
  6. Step 6: Final answer
    x = 812.88

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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.