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Finding the Fourth Proportional to 755.56, 1,042.72 and 419.48

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Solution

The fourth proportional to 755.56, 1,042.72 and 419.48 is: 578.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.56 : 1,042.72 = 419.48 : x
  2. Step 2: Convert to fraction form
    755.56/1,042.72 = 419.48/x
  3. Step 3: Cross multiply
    755.56x = 1,042.72 × 419.48
  4. Step 4: Simplify right side
    755.56x = 437,394.97
  5. Step 5: Solve for x
    x = 437,394.97/755.56
  6. Step 6: Final answer
    x = 578.91

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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.