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Finding the Fourth Proportional to 1,770.82, 2,657.36 and 991.33

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Solution

The fourth proportional to 1,770.82, 2,657.36 and 991.33 is: 1,487.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,770.82 : 2,657.36 = 991.33 : x
  2. Step 2: Convert to fraction form
    1,770.82/2,657.36 = 991.33/x
  3. Step 3: Cross multiply
    1,770.82x = 2,657.36 × 991.33
  4. Step 4: Simplify right side
    1,770.82x = 2,634,320.69
  5. Step 5: Solve for x
    x = 2,634,320.69/1,770.82
  6. Step 6: Final answer
    x = 1,487.63

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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.