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Finding the Fourth Proportional to 755.50, 1,042.54 and 419.40

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Solution

The fourth proportional to 755.50, 1,042.54 and 419.40 is: 578.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.50 : 1,042.54 = 419.40 : x
  2. Step 2: Convert to fraction form
    755.50/1,042.54 = 419.40/x
  3. Step 3: Cross multiply
    755.50x = 1,042.54 × 419.40
  4. Step 4: Simplify right side
    755.50x = 437,241.28
  5. Step 5: Solve for x
    x = 437,241.28/755.50
  6. Step 6: Final answer
    x = 578.74

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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.