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Finding the Fourth Proportional to 1,076.80, 1,614.40 and 427.20

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Solution

The fourth proportional to 1,076.80, 1,614.40 and 427.20 is: 640.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.80 : 1,614.40 = 427.20 : x
  2. Step 2: Convert to fraction form
    1,076.80/1,614.40 = 427.20/x
  3. Step 3: Cross multiply
    1,076.80x = 1,614.40 × 427.20
  4. Step 4: Simplify right side
    1,076.80x = 689,671.68
  5. Step 5: Solve for x
    x = 689,671.68/1,076.80
  6. Step 6: Final answer
    x = 640.48

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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.