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Finding the Fourth Proportional to 762.49, 1,142.92 and 275.40

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Solution

The fourth proportional to 762.49, 1,142.92 and 275.40 is: 412.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.49 : 1,142.92 = 275.40 : x
  2. Step 2: Convert to fraction form
    762.49/1,142.92 = 275.40/x
  3. Step 3: Cross multiply
    762.49x = 1,142.92 × 275.40
  4. Step 4: Simplify right side
    762.49x = 314,760.17
  5. Step 5: Solve for x
    x = 314,760.17/762.49
  6. Step 6: Final answer
    x = 412.81

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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.