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Finding the Fourth Proportional to 1,112.01, 1,534.38 and 639.80

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Solution

The fourth proportional to 1,112.01, 1,534.38 and 639.80 is: 882.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.01 : 1,534.38 = 639.80 : x
  2. Step 2: Convert to fraction form
    1,112.01/1,534.38 = 639.80/x
  3. Step 3: Cross multiply
    1,112.01x = 1,534.38 × 639.80
  4. Step 4: Simplify right side
    1,112.01x = 981,696.32
  5. Step 5: Solve for x
    x = 981,696.32/1,112.01
  6. Step 6: Final answer
    x = 882.81

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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.