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Finding the Fourth Proportional to 1,091.82, 1,508.48 and 761.72

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Solution

The fourth proportional to 1,091.82, 1,508.48 and 761.72 is: 1,052.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.82 : 1,508.48 = 761.72 : x
  2. Step 2: Convert to fraction form
    1,091.82/1,508.48 = 761.72/x
  3. Step 3: Cross multiply
    1,091.82x = 1,508.48 × 761.72
  4. Step 4: Simplify right side
    1,091.82x = 1,149,028.03
  5. Step 5: Solve for x
    x = 1,149,028.03/1,091.82
  6. Step 6: Final answer
    x = 1,052.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.