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Finding the Fourth Proportional to 755.68, 1,042.56 and 493.76

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Solution

The fourth proportional to 755.68, 1,042.56 and 493.76 is: 681.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.68 : 1,042.56 = 493.76 : x
  2. Step 2: Convert to fraction form
    755.68/1,042.56 = 493.76/x
  3. Step 3: Cross multiply
    755.68x = 1,042.56 × 493.76
  4. Step 4: Simplify right side
    755.68x = 514,774.43
  5. Step 5: Solve for x
    x = 514,774.43/755.68
  6. Step 6: Final answer
    x = 681.21

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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.