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Finding the Fourth Proportional to 762.19, 1,143.61 and 323.74

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Solution

The fourth proportional to 762.19, 1,143.61 and 323.74 is: 485.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.19 : 1,143.61 = 323.74 : x
  2. Step 2: Convert to fraction form
    762.19/1,143.61 = 323.74/x
  3. Step 3: Cross multiply
    762.19x = 1,143.61 × 323.74
  4. Step 4: Simplify right side
    762.19x = 370,230.60
  5. Step 5: Solve for x
    x = 370,230.60/762.19
  6. Step 6: Final answer
    x = 485.75

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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.