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Finding the Fourth Proportional to 763.38, 1,143.99 and 378.90

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Solution

The fourth proportional to 763.38, 1,143.99 and 378.90 is: 567.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.38 : 1,143.99 = 378.90 : x
  2. Step 2: Convert to fraction form
    763.38/1,143.99 = 378.90/x
  3. Step 3: Cross multiply
    763.38x = 1,143.99 × 378.90
  4. Step 4: Simplify right side
    763.38x = 433,457.81
  5. Step 5: Solve for x
    x = 433,457.81/763.38
  6. Step 6: Final answer
    x = 567.81

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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.