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Finding the Fourth Proportional to 762.34, 1,143.47 and 323.47

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Solution

The fourth proportional to 762.34, 1,143.47 and 323.47 is: 485.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.34 : 1,143.47 = 323.47 : x
  2. Step 2: Convert to fraction form
    762.34/1,143.47 = 323.47/x
  3. Step 3: Cross multiply
    762.34x = 1,143.47 × 323.47
  4. Step 4: Simplify right side
    762.34x = 369,876.19
  5. Step 5: Solve for x
    x = 369,876.19/762.34
  6. Step 6: Final answer
    x = 485.19

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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.