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Finding the Fourth Proportional to 1,113.49, 1,536.46 and 641.44

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Solution

The fourth proportional to 1,113.49, 1,536.46 and 641.44 is: 885.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.49 : 1,536.46 = 641.44 : x
  2. Step 2: Convert to fraction form
    1,113.49/1,536.46 = 641.44/x
  3. Step 3: Cross multiply
    1,113.49x = 1,536.46 × 641.44
  4. Step 4: Simplify right side
    1,113.49x = 985,546.90
  5. Step 5: Solve for x
    x = 985,546.90/1,113.49
  6. Step 6: Final answer
    x = 885.10

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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.