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Finding the Fourth Proportional to 1,076.66, 1,615.60 and 427.86

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Solution

The fourth proportional to 1,076.66, 1,615.60 and 427.86 is: 642.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.66 : 1,615.60 = 427.86 : x
  2. Step 2: Convert to fraction form
    1,076.66/1,615.60 = 427.86/x
  3. Step 3: Cross multiply
    1,076.66x = 1,615.60 × 427.86
  4. Step 4: Simplify right side
    1,076.66x = 691,250.62
  5. Step 5: Solve for x
    x = 691,250.62/1,076.66
  6. Step 6: Final answer
    x = 642.03

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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.