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Finding the Fourth Proportional to 1,076.84, 1,615.84 and 427.58

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Solution

The fourth proportional to 1,076.84, 1,615.84 and 427.58 is: 641.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.84 : 1,615.84 = 427.58 : x
  2. Step 2: Convert to fraction form
    1,076.84/1,615.84 = 427.58/x
  3. Step 3: Cross multiply
    1,076.84x = 1,615.84 × 427.58
  4. Step 4: Simplify right side
    1,076.84x = 690,900.87
  5. Step 5: Solve for x
    x = 690,900.87/1,076.84
  6. Step 6: Final answer
    x = 641.60

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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.