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Finding the Fourth Proportional to 1,076.53, 1,615.34 and 427.72

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Solution

The fourth proportional to 1,076.53, 1,615.34 and 427.72 is: 641.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.53 : 1,615.34 = 427.72 : x
  2. Step 2: Convert to fraction form
    1,076.53/1,615.34 = 427.72/x
  3. Step 3: Cross multiply
    1,076.53x = 1,615.34 × 427.72
  4. Step 4: Simplify right side
    1,076.53x = 690,913.22
  5. Step 5: Solve for x
    x = 690,913.22/1,076.53
  6. Step 6: Final answer
    x = 641.80

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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.