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Finding the Fourth Proportional to 1,077.03, 1,615.86 and 427.86

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Solution

The fourth proportional to 1,077.03, 1,615.86 and 427.86 is: 641.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.03 : 1,615.86 = 427.86 : x
  2. Step 2: Convert to fraction form
    1,077.03/1,615.86 = 427.86/x
  3. Step 3: Cross multiply
    1,077.03x = 1,615.86 × 427.86
  4. Step 4: Simplify right side
    1,077.03x = 691,361.86
  5. Step 5: Solve for x
    x = 691,361.86/1,077.03
  6. Step 6: Final answer
    x = 641.92

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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.