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Finding the Fourth Proportional to 1,076.55, 1,615.02 and 427.20

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Solution

The fourth proportional to 1,076.55, 1,615.02 and 427.20 is: 640.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.55 : 1,615.02 = 427.20 : x
  2. Step 2: Convert to fraction form
    1,076.55/1,615.02 = 427.20/x
  3. Step 3: Cross multiply
    1,076.55x = 1,615.02 × 427.20
  4. Step 4: Simplify right side
    1,076.55x = 689,936.54
  5. Step 5: Solve for x
    x = 689,936.54/1,076.55
  6. Step 6: Final answer
    x = 640.88

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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.