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Finding the Fourth Proportional to 762.39, 1,143.42 and 275.17

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Solution

The fourth proportional to 762.39, 1,143.42 and 275.17 is: 412.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.39 : 1,143.42 = 275.17 : x
  2. Step 2: Convert to fraction form
    762.39/1,143.42 = 275.17/x
  3. Step 3: Cross multiply
    762.39x = 1,143.42 × 275.17
  4. Step 4: Simplify right side
    762.39x = 314,634.88
  5. Step 5: Solve for x
    x = 314,634.88/762.39
  6. Step 6: Final answer
    x = 412.70

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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.