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Finding the Fourth Proportional to 1,091.98, 1,638.26 and 475.81

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Solution

The fourth proportional to 1,091.98, 1,638.26 and 475.81 is: 713.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.98 : 1,638.26 = 475.81 : x
  2. Step 2: Convert to fraction form
    1,091.98/1,638.26 = 475.81/x
  3. Step 3: Cross multiply
    1,091.98x = 1,638.26 × 475.81
  4. Step 4: Simplify right side
    1,091.98x = 779,495.80
  5. Step 5: Solve for x
    x = 779,495.80/1,091.98
  6. Step 6: Final answer
    x = 713.84

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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.