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Finding the Fourth Proportional to 754.38, 1,130.79 and 388.35

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Solution

The fourth proportional to 754.38, 1,130.79 and 388.35 is: 582.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.38 : 1,130.79 = 388.35 : x
  2. Step 2: Convert to fraction form
    754.38/1,130.79 = 388.35/x
  3. Step 3: Cross multiply
    754.38x = 1,130.79 × 388.35
  4. Step 4: Simplify right side
    754.38x = 439,142.30
  5. Step 5: Solve for x
    x = 439,142.30/754.38
  6. Step 6: Final answer
    x = 582.12

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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.