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Finding the Fourth Proportional to 762.79, 1,143.75 and 300.03

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Solution

The fourth proportional to 762.79, 1,143.75 and 300.03 is: 449.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.79 : 1,143.75 = 300.03 : x
  2. Step 2: Convert to fraction form
    762.79/1,143.75 = 300.03/x
  3. Step 3: Cross multiply
    762.79x = 1,143.75 × 300.03
  4. Step 4: Simplify right side
    762.79x = 343,159.31
  5. Step 5: Solve for x
    x = 343,159.31/762.79
  6. Step 6: Final answer
    x = 449.87

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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.