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Finding the Fourth Proportional to 764.34, 1,143.97 and 657.42

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Solution

The fourth proportional to 764.34, 1,143.97 and 657.42 is: 983.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.34 : 1,143.97 = 657.42 : x
  2. Step 2: Convert to fraction form
    764.34/1,143.97 = 657.42/x
  3. Step 3: Cross multiply
    764.34x = 1,143.97 × 657.42
  4. Step 4: Simplify right side
    764.34x = 752,066.52
  5. Step 5: Solve for x
    x = 752,066.52/764.34
  6. Step 6: Final answer
    x = 983.95

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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.