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Finding the Fourth Proportional to 1,649.40, 2,475.01 and 991.48

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Solution

The fourth proportional to 1,649.40, 2,475.01 and 991.48 is: 1,487.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,649.40 : 2,475.01 = 991.48 : x
  2. Step 2: Convert to fraction form
    1,649.40/2,475.01 = 991.48/x
  3. Step 3: Cross multiply
    1,649.40x = 2,475.01 × 991.48
  4. Step 4: Simplify right side
    1,649.40x = 2,453,910.54
  5. Step 5: Solve for x
    x = 2,453,910.54/1,649.40
  6. Step 6: Final answer
    x = 1,487.76

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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.