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Finding the Fourth Proportional to 755.60, 1,043.44 and 493.76

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Solution

The fourth proportional to 755.60, 1,043.44 and 493.76 is: 681.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.60 : 1,043.44 = 493.76 : x
  2. Step 2: Convert to fraction form
    755.60/1,043.44 = 493.76/x
  3. Step 3: Cross multiply
    755.60x = 1,043.44 × 493.76
  4. Step 4: Simplify right side
    755.60x = 515,208.93
  5. Step 5: Solve for x
    x = 515,208.93/755.60
  6. Step 6: Final answer
    x = 681.85

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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.