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Finding the Fourth Proportional to 1,121.82, 1,548.03 and 649.59

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Solution

The fourth proportional to 1,121.82, 1,548.03 and 649.59 is: 896.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.82 : 1,548.03 = 649.59 : x
  2. Step 2: Convert to fraction form
    1,121.82/1,548.03 = 649.59/x
  3. Step 3: Cross multiply
    1,121.82x = 1,548.03 × 649.59
  4. Step 4: Simplify right side
    1,121.82x = 1,005,584.81
  5. Step 5: Solve for x
    x = 1,005,584.81/1,121.82
  6. Step 6: Final answer
    x = 896.39

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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.