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Finding the Fourth Proportional to 737.76, 1,104.80 and 428.80

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Solution

The fourth proportional to 737.76, 1,104.80 and 428.80 is: 642.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    737.76 : 1,104.80 = 428.80 : x
  2. Step 2: Convert to fraction form
    737.76/1,104.80 = 428.80/x
  3. Step 3: Cross multiply
    737.76x = 1,104.80 × 428.80
  4. Step 4: Simplify right side
    737.76x = 473,738.24
  5. Step 5: Solve for x
    x = 473,738.24/737.76
  6. Step 6: Final answer
    x = 642.13

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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.