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Finding the Fourth Proportional to 737.72, 1,018.20 and 427.28

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Solution

The fourth proportional to 737.72, 1,018.20 and 427.28 is: 589.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    737.72 : 1,018.20 = 427.28 : x
  2. Step 2: Convert to fraction form
    737.72/1,018.20 = 427.28/x
  3. Step 3: Cross multiply
    737.72x = 1,018.20 × 427.28
  4. Step 4: Simplify right side
    737.72x = 435,056.50
  5. Step 5: Solve for x
    x = 435,056.50/737.72
  6. Step 6: Final answer
    x = 589.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.