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Finding the Fourth Proportional to 1,305.22, 1,957.90 and 427.81

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Solution

The fourth proportional to 1,305.22, 1,957.90 and 427.81 is: 641.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.22 : 1,957.90 = 427.81 : x
  2. Step 2: Convert to fraction form
    1,305.22/1,957.90 = 427.81/x
  3. Step 3: Cross multiply
    1,305.22x = 1,957.90 × 427.81
  4. Step 4: Simplify right side
    1,305.22x = 837,610.27
  5. Step 5: Solve for x
    x = 837,610.27/1,305.22
  6. Step 6: Final answer
    x = 641.74

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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.