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Finding the Fourth Proportional to 1,077.09, 1,615.77 and 427.68

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Solution

The fourth proportional to 1,077.09, 1,615.77 and 427.68 is: 641.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.09 : 1,615.77 = 427.68 : x
  2. Step 2: Convert to fraction form
    1,077.09/1,615.77 = 427.68/x
  3. Step 3: Cross multiply
    1,077.09x = 1,615.77 × 427.68
  4. Step 4: Simplify right side
    1,077.09x = 691,032.51
  5. Step 5: Solve for x
    x = 691,032.51/1,077.09
  6. Step 6: Final answer
    x = 641.57

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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.