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Finding the Fourth Proportional to 947.82, 1,421.20 and 727.90

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Solution

The fourth proportional to 947.82, 1,421.20 and 727.90 is: 1,091.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.82 : 1,421.20 = 727.90 : x
  2. Step 2: Convert to fraction form
    947.82/1,421.20 = 727.90/x
  3. Step 3: Cross multiply
    947.82x = 1,421.20 × 727.90
  4. Step 4: Simplify right side
    947.82x = 1,034,491.50
  5. Step 5: Solve for x
    x = 1,034,491.50/947.82
  6. Step 6: Final answer
    x = 1,091.44

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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.