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Finding the Fourth Proportional to 762.82, 1,143.37 and 499.78

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Solution

The fourth proportional to 762.82, 1,143.37 and 499.78 is: 749.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.82 : 1,143.37 = 499.78 : x
  2. Step 2: Convert to fraction form
    762.82/1,143.37 = 499.78/x
  3. Step 3: Cross multiply
    762.82x = 1,143.37 × 499.78
  4. Step 4: Simplify right side
    762.82x = 571,435.51
  5. Step 5: Solve for x
    x = 571,435.51/762.82
  6. Step 6: Final answer
    x = 749.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.