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Finding the Fourth Proportional to 764.28, 1,145.16 and 455.76

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Solution

The fourth proportional to 764.28, 1,145.16 and 455.76 is: 682.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.28 : 1,145.16 = 455.76 : x
  2. Step 2: Convert to fraction form
    764.28/1,145.16 = 455.76/x
  3. Step 3: Cross multiply
    764.28x = 1,145.16 × 455.76
  4. Step 4: Simplify right side
    764.28x = 521,918.12
  5. Step 5: Solve for x
    x = 521,918.12/764.28
  6. Step 6: Final answer
    x = 682.89

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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.