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Finding the Fourth Proportional to 2,634.80, 3,953.21 and 991.76

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Solution

The fourth proportional to 2,634.80, 3,953.21 and 991.76 is: 1,488.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,634.80 : 3,953.21 = 991.76 : x
  2. Step 2: Convert to fraction form
    2,634.80/3,953.21 = 991.76/x
  3. Step 3: Cross multiply
    2,634.80x = 3,953.21 × 991.76
  4. Step 4: Simplify right side
    2,634.80x = 3,920,610.82
  5. Step 5: Solve for x
    x = 3,920,610.82/2,634.80
  6. Step 6: Final answer
    x = 1,488.01

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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.