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Finding the Fourth Proportional to 755.62, 1,042.47 and 578.39

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Solution

The fourth proportional to 755.62, 1,042.47 and 578.39 is: 797.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.62 : 1,042.47 = 578.39 : x
  2. Step 2: Convert to fraction form
    755.62/1,042.47 = 578.39/x
  3. Step 3: Cross multiply
    755.62x = 1,042.47 × 578.39
  4. Step 4: Simplify right side
    755.62x = 602,954.22
  5. Step 5: Solve for x
    x = 602,954.22/755.62
  6. Step 6: Final answer
    x = 797.96

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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.