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Finding the Fourth Proportional to 1,083.28, 1,495.20 and 641.56

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Solution

The fourth proportional to 1,083.28, 1,495.20 and 641.56 is: 885.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.28 : 1,495.20 = 641.56 : x
  2. Step 2: Convert to fraction form
    1,083.28/1,495.20 = 641.56/x
  3. Step 3: Cross multiply
    1,083.28x = 1,495.20 × 641.56
  4. Step 4: Simplify right side
    1,083.28x = 959,260.51
  5. Step 5: Solve for x
    x = 959,260.51/1,083.28
  6. Step 6: Final answer
    x = 885.51

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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.