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Finding the Fourth Proportional to 761.32, 1,142.39 and 328.38

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Solution

The fourth proportional to 761.32, 1,142.39 and 328.38 is: 492.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.32 : 1,142.39 = 328.38 : x
  2. Step 2: Convert to fraction form
    761.32/1,142.39 = 328.38/x
  3. Step 3: Cross multiply
    761.32x = 1,142.39 × 328.38
  4. Step 4: Simplify right side
    761.32x = 375,138.03
  5. Step 5: Solve for x
    x = 375,138.03/761.32
  6. Step 6: Final answer
    x = 492.75

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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.