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Finding the Fourth Proportional to 763.28, 1,142.09 and 455.30

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Solution

The fourth proportional to 763.28, 1,142.09 and 455.30 is: 681.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.28 : 1,142.09 = 455.30 : x
  2. Step 2: Convert to fraction form
    763.28/1,142.09 = 455.30/x
  3. Step 3: Cross multiply
    763.28x = 1,142.09 × 455.30
  4. Step 4: Simplify right side
    763.28x = 519,991.30
  5. Step 5: Solve for x
    x = 519,991.30/763.28
  6. Step 6: Final answer
    x = 681.26

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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.