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Finding the Fourth Proportional to 753.48, 1,128.99 and 387.75

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Solution

The fourth proportional to 753.48, 1,128.99 and 387.75 is: 580.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.48 : 1,128.99 = 387.75 : x
  2. Step 2: Convert to fraction form
    753.48/1,128.99 = 387.75/x
  3. Step 3: Cross multiply
    753.48x = 1,128.99 × 387.75
  4. Step 4: Simplify right side
    753.48x = 437,765.87
  5. Step 5: Solve for x
    x = 437,765.87/753.48
  6. Step 6: Final answer
    x = 580.99

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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.