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Finding the Fourth Proportional to 763.10, 1,144.63 and 300.55

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Solution

The fourth proportional to 763.10, 1,144.63 and 300.55 is: 450.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.10 : 1,144.63 = 300.55 : x
  2. Step 2: Convert to fraction form
    763.10/1,144.63 = 300.55/x
  3. Step 3: Cross multiply
    763.10x = 1,144.63 × 300.55
  4. Step 4: Simplify right side
    763.10x = 344,011.32
  5. Step 5: Solve for x
    x = 344,011.32/763.10
  6. Step 6: Final answer
    x = 450.81

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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.