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Finding the Fourth Proportional to 98,805.72, 136,078.26 and 85,372.68

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Solution

The fourth proportional to 98,805.72, 136,078.26 and 85,372.68 is: 117,577.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,805.72 : 136,078.26 = 85,372.68 : x
  2. Step 2: Convert to fraction form
    98,805.72/136,078.26 = 85,372.68/x
  3. Step 3: Cross multiply
    98,805.72x = 136,078.26 × 85,372.68
  4. Step 4: Simplify right side
    98,805.72x = 11,617,365,745.94
  5. Step 5: Solve for x
    x = 11,617,365,745.94/98,805.72
  6. Step 6: Final answer
    x = 117,577.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.